MdeModulePkg/Library/VarCheckLib: Allow SetVariable from SMM

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3154

Update VarCheckLibSetVariableCheck() to allow locked variables
to be updated if the RequestSource is VarCheckFromTrusted even
if one or more variable check handlers return EFI_WRITE_PROTECTED.
RequestSource is only set to VarCheckFromTrusted if the request
is through the EFI_SMM_VARAIBLE_PROTOCOL.

Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
(cherry picked from commit 248d08c5983b561549891fec54c213e1f354179c)
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
1 file changed