power: regulator: replace printf() with pr_err()

Replace printf() with pr_err() because pr_err() has a uniform print format
and takes into consideration the log levels supported.

Signed-off-by: Shree Ramamoorthy <s-ramamoorthy@ti.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
1 file changed