Integrate 5.x SMC API changes, add 4.x specific setup, implement target firmware selection

Fix LP0 TZRAM CMAC calculation

Fix LP0 entry. Exit still fails in warmboot bin.

Fix CpuSuspend not making it to finalize_powerdown()

Fix flow controller set functions

Refactor 32-bit register definitions

Add most of warmboot_main

Cleanup TODOs, implement bootconfig SCR_EL3 bit setting

Implement a few TODOs with CAR driver.

Implement more SE context save functionality

Implement the rest of smcCpuSuspend with skeleton SE API calls.

Uncomment more sleep/suspend code

Uncomment BPMP firmware copy in LP0

Rename cache.s/.h to arm.s/.h

Skeleton smcCpuOff, fix building, fix smcConfigureCarveout

Adapt code to match last commit, link in bpmpfw_bin(_size)

Start implementing smcCpuSuspend