Sync patches r15328, r15329, r15330, r15331, r15332, r15333, r15334, r15336, r15337, r15338, r15339, r15340, r15351 and r15356 from main trunk.
1. Remove ASSERT when failed to Get/Set "AttemptOrder" and "ClientId" variable.
   Removes RT attribute for "AttemptOrder" variable.
2. Fix the return status when physical presence variable and MemoryOverwriteRequestControl variable are corrupt.
3. Remove ASSERT check for SetVariable in FirmwarePerformanceDataTableDxe.
4. Add comments to describe PlatformDriOverrideDxe is used for test purpose. 
5. Remove unnecessary dependency in variable driver.
6. Remove the RT attribute for the MemoryTypeInformation variable because it’s not necessary.
7. Add comments for PcdHideTpmSupport.
8. Remove ASSERT when SetVariable for ConOutDev/ConInDev/ErrOutDev variables failed.
9. IntelFrameworkModulePkg AcpiS3SaveDxe: Remove ASSERT, add lock and remove RT for AcpiGlobalVariable variable.
10.Did proper error handling when SetVariable failed, and put RTC write operation at the behind of SetVariable, if SetVariable failed, RTC content could not be changed.
11.Fix the return value bug when updating public key database variable failure.
12.MdeModulePkg/SecurityPkg Variable: Return error status to avoid inconsistency between PlatformLang and Lang.
13.Removes MacString Rt attribute in Ip4Config/Mnp driver.
14.Force UID modules build error to warn user that currently it is just a sample.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/branches/UDK2014/PcAtChipsetPkg@15440 6f19259b-4bc3-4df7-8a09-765794883524