Sync patch r14428 from main trunk.
MdeModulePkg/AtaBus: wait up to 30s for ATA cmd response in Standby/Idle mode to follow ATA spec.


git-svn-id: svn://svn.code.sf.net/p/edk2/code/branches/UDK2010.SR1/MdeModulePkg@14708 6f19259b-4bc3-4df7-8a09-765794883524