scsi: ufs-qcom: fix bug with read/modify write of UFS_CFG1

ufs_qcom_print_hw_debug_reg_all() function is having a bug
where it might incorrectly modify undesired bits in UFS_CFG1 register,
this change fixes it.

Change-Id: I2605beeb41f3c319877f48e35723f597f7dfb9da
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>