boot/efi/x86: implement SMP detection and bootup

* move common SMP initialization code to x86/arch_smp.cpp

* factor out arch-specific SMP initialization to
arch_smp_32.cpp resp arch_smp_64.cpp

* implement smp_trampoline for x86 32-bit EFI loader

* rename SMP trampoline for x86_64 to long_smp_trampoline

* add new argument virtKernelArgs to arch_smp_boot_other_cpus
as the kernel args are not identity mapped on 32-bit architectures

Change-Id: I30d0bb1fa9bfb08f6784a2af34eb83d6b64afa57
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4869
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>

platform/efi: platform_cpu_info

* This models the CpuInfo into a cross-architecture
platform_cpu_info
* Originally I was looking at merging this with "arch_cpu_info"
however that is "overall cpu" while CpuInfo is "indivial core
information" packed into an array.
* Since every dtb platform will report individual cores in fdt,
having a common cpu core info struct with at minimum the core
id makes sense.
* This could likely be refined further to some kind of core info
packed inside of arch_cpu_info, but this will fix arm,arm64,etc
for now until someone wants to dive into that.

Change-Id: Ia18a352403cd0da7130c1e637fc205d4311478ef
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4363
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

efi/arm: Begin stubbing out the essentials, add fdt library

* We *might* no longer need FDT knowledge in the bootloader?
* For now though, arm sources reference gFDT, so we need it.
* Need to move away from lazy gFDT and store in arch_kernel_args.
(which is next and will be a larger commit)

Change-Id: I77cce0fc645143b78a7fd9f50ac8b96c97b5c862
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2268
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>