trivial: Style changed files

nvidia: Remove unnecessary nv_tmr_config_t struct

This is no longer used and can be deleted.

nvidia: Del. get_nth_irq/pmem & related functions

Now that the hard-coded addresses and IRQ numbers are being removed,
these functions are no longer necessary.

nvidia: Move timer HW management to driver level

Instead of allocating and managing all resources in the ltimer level,
this commit refactors the related code and moves them into the driver
level. This moves the responsibilities down into a more suitable
abstraction level.

libplatsupport: Change NVIDIA plat default timers

We use TMR1 instead of TMR0 due to the fact that
the IRQ for TMR1 is missing from the DTS file for
TX1. It exists for TX2, but for the sake of
compatibility, we use TMR1 for both.

platsupport: Refactor TX2 timers to use 4k mapping

The TK1 and TX1 timers we use are all located within a 4k region.
However, on TX2 the timers are each on a separate 64k region. We need to
create multiple mappings to implement a logical timer because of this.
In the timer driver we also can't assume that the mapping is contiguous.

platsupport: Split nvidia definitions into plat

This is in preparation for the tx2 build which has the same devices but
with different interrupt and address mappings.

platsupport: TK1 NVTMR: Enable periodic mode support

Remove pstimer from nvidia timers, refactor to suite ltimers

Fix whitespace

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

fix licenses

libplatsupport: add tx1 platform

libplatsupport: create mach folder for nvidia machines