MdeModulePkg/Ide: return correct status when DRQ is not ready for ATAPI

MdeModulePkg/Ide: return correct status when DRQ is not ready for ATAPI

When executing ATAPI cmd at IDE mode, EFI_SUCCESS may be returned wrongly
with old logic but in fact DRQ is not ready and the transaction doesn't
get executed correctly at this time.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19611 6f19259b-4bc3-4df7-8a09-765794883524