scsi: ufs: core: Remove redundant HPB unmap

Since the HPB mapping is already reset in ufshpb_init() by setting flag
QUERY_FLAG_IDN_HPB_RESET, there is no need doing so again in
ufshpb_hpb_lu_prepared().

This also resolves the issue where HPB WRITE BUFFER is issued before UAC is
cleared.

Link: https://lore.kernel.org/r/20220412073131.10644-1-powen.kao@mediatek.com


Acked-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>