fix(intel): update Agilex5 warm reset subroutines

Update the 'plat_get_my_entrypoint' assembly routine to
differentiate between cold reset, warm reset and SMP
secondary boot cores request.
Add secondary core boot request markup in BL31.
Perform CACHE flush/clean ops in case of warm reset request also.

Change-Id: I7d33e362a3a513c60c8333e062ce832aa7facf38
Signed-off-by: Girisha Dengi <girisha.dengi@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
4 files changed