Arch: Abstract PSPLIM setting

Add tfm_core_arch_set_psplim() to abstract PSPLIM setting.
Implement tfm_core_arch_set_psplim() on Armv8-M.

Change-Id: Ia23c8bb4e5b8c985dffaaa8bb8a7b4b485608be9
Signed-off-by: David Hu <david.hu@arm.com>
3 files changed