Produce StandaloneMM Entry/Exit Notify Protocol for PlatformHook.
This replaces the SMM core platform hook implementation in the
traditional SMM (Edk2\MdeModulePkg\Include\Library\SmmCorePlatformHookLib.h).
Unlike traditional SMM, Standalone MM prefers a more generic method to
perform platform-specific tasks before and after the SMI handler. Therefore,
it introduces the gMmEntryNotifyProtocolGuid and gMmExitNotifyProtocolGuid
protocols to notify the SMM entry and exit. This approach is more flexible
for the platform, eliminating the need to place all tasks in
PlatformHookBeforeSmmDispatch() and PlatformHookAfterSmmDispatch(), thus
platform code can depend on the protocol notification to perform
platform-specific tasks.
Signed-off-by: Diat Siah Yap <diat.siah.yap@intel.com>
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