HAL: Duplicates three legacy tfm_spm_hal_* APIs for IPC Model

This patch duplicates the following APIs for IPC Model in platform HAL
and renames them:
 - tfm_spm_hal_get_ns_VTOR -> tfm_hal_get_ns_VTOR
 - tfm_spm_hal_get_ns_entry_point -> tfm_hal_get_ns_entry_point
 - tfm_spm_hal_get_ns_MSP -> tfm_hal_get_ns_MSP

This original ones are kept for Library Model for now for easier
potential deprecation of Library Model in the future.

Change-Id: Ic8196a4335514c9fa828892b6a4c90dc6ed9fd79
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
21 files changed