MdeModulePkg/UsbMass: Revert POWER_ON(29h) ASC handling logic

MdeModulePkg/UsbMass: Revert POWER_ON(29h) ASC handling logic

This reverts commit 6461344c318cd43a5494c0302e142a0cbe386d52.
* MdeModulePkg/UsbMass: Fix hot-plug USB CDROM can't be recognized

UsbBootExecCmd() only calls UsbBootRequestSense() to get sense key
when CMD fails.
When POWER ON (29h) ASC returns from REQUEST SENSE, implementation
should retry the CMD, instead of treating this as a SUCCESS.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>