Fix 2 BootScript thunk issue on MEM_POLL.

Fix 2 BootScript thunk issue on MEM_POLL.

1)	MEM_POLL stall time is incorrect.
Framework version: Duration is used for Stall(), which is Microseconds.
                   Total time is: Duration(Microseconds) * LoopTimes.
PI version:        Duration is always 100ns. Delay is LoopTimes.
                   Total time is: 100ns * Delay.
So Delay = Duration(Microseconds) * LoopTimes / 100ns
         = Duration * 1000ns * LoopTimes / 100ns
         = Duration * 10 * LoopTimes

2)	MEM_POLL BitMask/BitValue order is incorrect.
Framework version: First BitMask, then BitValue
PI version: First Data, then DataMask
So we revert their order in function call

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11595 6f19259b-4bc3-4df7-8a09-765794883524