scsi: ufs: Declare ufshcd_wait_for_register() static

Declare this function static since it is only used inside the ufshcd.c
source file.

Link: https://lore.kernel.org/r/20220419225811.4127248-3-bvanassche@acm.orgTested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufshcd.c

@@ -639,7 +639,7 @@ EXPORT_SYMBOL_GPL(ufshcd_delay_us);
  * Return:
  * -ETIMEDOUT on error, zero on success.
  */
-int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
+static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
 				u32 val, unsigned long interval_us,
 				unsigned long timeout_ms)
 {

drivers/scsi/ufs/ufshcd.h

@@ -1028,9 +1028,6 @@ void ufshcd_remove(struct ufs_hba *);
 int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
 int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
 void ufshcd_delay_us(unsigned long us, unsigned long tolerance);
-int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
-				u32 val, unsigned long interval_us,
-				unsigned long timeout_ms);
 void ufshcd_parse_dev_ref_clk_freq(struct ufs_hba *hba, struct clk *refclk);
 void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val);
 void ufshcd_hba_stop(struct ufs_hba *hba);