soc: arm64: Add agilex5 soc folder and its configurations

Add Agilex5 soc folder, MMU table and its configurations for
Intel SoC FPGA Agilex5 platform for initial bring up.
Add ARM Cortex-a76 and Cortex-a55 HMP cluster type.

Signed-off-by: Teik Heng Chong <teik.heng.chong@intel.com>
Signed-off-by: Girisha Dengi <girisha.dengi@intel.com>