scsi: ufs: read length should give full buffer

ufshcd_read_desc_param() will allocate full-size buffer and give it required
data back. Otherwise, it can cause memory buffer corruption.

Bug: 77551464
Change-Id: I84ed0cd1470c0dcc12f0aff9d631433fe16244e4
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>