scsi: ufs: core: Fix WB resize using wrong offset

Commit 500d4b74 ("scsi: ufs: core: Add WB buffer resize support")
incorrectly reads the value of offset
DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP to determine whether WB resize is
supported.

Fix the issue by reading the value of DEVICE_DESC_PARAM_EXT_WB_SUP to
determine whether the device supports WB resize.

Fixes: 500d4b74 ("scsi: ufs: core: Add WB buffer resize support")
Reported-by: Peter Wang <peter.wang@mediatek.com>
Closes: https://lore.kernel.org/all/7ce05b28f5d4b4b4973244310010c1487


Signed-off-by: Huan Tang <tanghuan@vivo.com>
Link: https://lore.kernel.org/r/20250423092917.1031-1-tanghuan@vivo.com


Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>