scsi: ufs: fix endianness sparse warnings

Fix many warnings with incorrect endian assumptions
which makes the code unportable to new architectures.

The UFS specification defines the byte order as big-endian
for UPIU structure and little-endian for the host controller
transfer/task management descriptors.

Change-Id: I22102f083a0838f2d1cea1b2d9bfca2bd0d0cfee
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>