scsi: ufs: fix mixing different enum types

Sparse tool complains about mixing different enum types.

drivers/scsi/ufs/ufshcd.c:1245:61: warning: mixing different enum types
drivers/scsi/ufs/ufshcd.c:1245:61:     int enum flag_idn  versus
drivers/scsi/ufs/ufshcd.c:1245:61:     int enum attr_idn

Change-Id: I5bd108d9497aa9eebd9cf91e030b7984447f377b
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>