Added SpiHc DXE and SMM drivers. This code receives bus transactions
from the SpiBus layer and passes them onto the SpiHcPlatformLib
Platform Initialization Spec 1.7 volume 5 section 18.1.7
Bugzilla #4753
Cc: Abner Chang <abner.chang@amd.com>
Cc: Abdul Lateef Attar <AbdulLateef.Attar@amd.com>
Signed-off-by: Brit Chesley <brit.chesley@amd.com>
Reviewed-by: Abner Chang <abner.chang@amd.com>
Brit Chesley