Merge changes from topic "xlnx_versal_custom_sip" into integration

* changes:
feat(versal): add hooks for mmap and early setup
refactor(zynqmp): refactor custom sip service

refactor(zynqmp): refactor custom sip service

Refactored the custom SIP service code and relocated it to a
common directory to support additional platforms and enhance
code readability. Renamed ZYNQ

refactor(zynqmp): refactor custom sip service

Refactored the custom SIP service code and relocated it to a
common directory to support additional platforms and enhance
code readability. Renamed ZYNQMP_SIP_SVC_CUSTOM to a generic
SOC_SIP_SVC_CUSTOM for better with other across SoCs

Change-Id: Id114f717d0397e257a831c7d5b67104c2c766d09
Signed-off-by: Prasad Kummari <prasad.kummari@amd.com>

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