Platforms/RaspberryPi: SMBIOS Type 7 fixes

Various fixes and enhancements for SMBIOS Type 7:
 - Break into 3 instances (L1 Instruction, L1 Data, and L2 cache)
 - Use correct values for RPi4 and RPi3 SoCs
 - Add Type 4 association with type 7 handles

Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Pete Batard <pete@akeo.ie>
Cc: Andrei Warkentin <awarkentin@vmware.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Samer El-Haj-Mahmoud <samer.el-haj-mahmoud@arm.com>
Reviewed-by: Andrei Warkentin <awarkentin@vmware.com>