arm64: versal2: Move SoC detection out of board code

soc_detection() and soc_name_decode() read the PMC_TAP version/idcode
registers and decode the platform. This is SoC information rather than
board policy, and a firmware interface could provide it instead, so it
does not belong in board code.

Move both functions, together with the shared platform_id and
platform_version state, into arch/arm/mach-versal2 where they still
override the weak stubs in the Xilinx common board code. The board file
drops the now unused linux/bitfield.h include.

Signed-off-by: Michal Simek <[email protected]>
Link: https://patch.msgid.link/c332ab27f66f1c808f32a4bcb453d9e8da543331.1782219202.git.michal.simek@amd.com

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