MdeModulePkg/VariablePolicy: Add more granular variable policy querying

Introduces two new APIs to EDKII_VARIABLE_POLICY_PROTOCOL:
  1. GetVariablePolicyInfo()
  2. GetLockOnVariableStateVariablePolicyInfo()

These allow a caller to retrieve policy information associated with
a UEFI variable given the variable name and vendor GUID.

GetVariablePolicyInfo() - Returns the variable policy applied to the
UEFI variable. If the variable policy is applied toward an individual
UEFI variable, that name can optionally be returned.

GetLockOnVariableStateVariablePolicyInfo() - Returns the Lock on
Variable State policy applied to the UEFI variable. If the Lock on
Variable State policy is applied to a specific variable name, that
name can optionally be returned.

These functions can be useful for a variety of purposes such as
auditing, testing, and functional flows.

Also fixed some variable name typos in code touched by the changes.

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Message-Id: <20231030203112.736-2-mikuback@linux.microsoft.com>

MdeModulePkg/Universal/Variable/RuntimeDxe/VariableDxe.c

@@ -33,7 +33,9 @@ EDKII_VARIABLE_POLICY_PROTOCOL  mVariablePolicyProtocol      = {
   ProtocolIsVariablePolicyEnabled,
   RegisterVariablePolicy,
   DumpVariablePolicy,
-  LockVariablePolicy
+  LockVariablePolicy,
+  GetVariablePolicyInfo,
+  GetLockOnVariableStateVariablePolicyInfo
 };
 EDKII_VAR_CHECK_PROTOCOL        mVarCheck = {
   VarCheckRegisterSetVariableCheckHandler,