soc: microchip: sam: sama7: add sama7g54 (System-in-Package) SIP SoCs

Add SAMA7G5 series System-in-Package (SiP) MPUs to Kconfig.soc and
soc.yml, update the header files for them too.

Signed-off-by: Tony Han <tony.han@microchip.com>
4 files changed