trivial: Add Arm smmu guard

Signed-off-by: Oliver Scott <Oliver.Scott@data61.csiro.au>

API for init SMMU caps

Signed-off-by: Oliver Scott <Oliver.Scott@data61.csiro.au>

sperating tx2_smmu from arm_smmu

Signed-off-by: Oliver Scott <Oliver.Scott@data61.csiro.au>

trivial: Fix style

mcs: Rename CONFIG_KERNEL_RT to CONFIG_KERNEL_MCS

This is to be consistent with the name defined in the kernel.

libsel4simple: Fix translation of cap numbers to CPtrs

seL4_CapIOPortControl only exists on x86, while seL4_CapIOSpace only
exists on x86 with an IOMMU.
Simple does not address these on other configurations.
Ensure that this is correctly accounted for on all configurations and
architectures.

New I/O port interface in simple

This changes the simple interface for getting I/O port capabilities to instead of returning
a potentially pre-existing capability for an I/O port, the caller provides a location in
a cnode to place the requested I/O port. The reason for this change is that I/O ports will
soon be being provided from the kernel by a control cap and this design keeps simple as an
information interface that does not need to do internal allocation. Rather allocation is
only performed explicitly by the caller.

simple: Remove arch_info interface

`archInfo` has been removed from the kernel and the extended bootinfo is the flexible
replacement to it.

pragma once and for all

Add scheduling context support in seL4_libs

Only works if CONFIG_KERNEL_RT is enabled, however most of the code
is compiled no mater what to lighten the maintenance burden

Fix all the whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of files

Fix licenses

libsel4simple: add get_extended_bootinfo_length

Returns header length of extra bootinfo section

libsel4simple: Define simple interface for retrieving extended bootinfo information

libsel4simple: Add get_arch_info function

SELFOUR-610: libsel4simple: Deprecate simple_get_IRQ_control in favour of simple_get_IRQ_handler

simple: add core count callback to simpel-default

libsel4simple: Remove 32-bit size assumptions

SELFOUR-421 Handle updated bootinfo with device untypeds

Updates the simple-default implementation, and libsel4debug, to
handle the removal of device frames and addition of device untypeds
to bootinfo.

libsel4simple: support for ARM IOSpace caps

libsel4simple: Use arch_simple to access iospace

sel4simple: add arch specific interface

This commit defines arch_simple_t, which adds arch
specific functions to libsel4simple and its implementors,
as the seL4 API no longer allows simple implementation to be
architecture agnostic, specifically for the interrupt handling
interface.

This commit adds the x86 arch interface which defines functions
for getting irqs, msis and ioports, and the arm interface
which just defines irqs.

libsel4simple-stable has been updated to implement the new
interface and users should not be effected. However, other
implementations of simple will need to be updated.

libsel4platsupport has been updated such that the hpet driver
wrapper now works with the lastest seL4 kernel.

libsel4simple: Return InvalidArgument in wrappers

Functions wrapping syscalls return the seL4_Error value
seL4_InvalidArgument rather than -1.

sel4simple: clean up

Report errors when functions don't exist rather than assert failing.
This stops threads from faulting in release mode where assert isn't
defined.

Also run make style for some consistency.