regulator: core: use debug level print in regulator_check_drms

When calling regulator_set_load, regulator_check_drms prints and returns
an error if the regulator device's flag REGULATOR_CHANGE_DRMS isn't set.
drms_uA_update, however, bails out without reporting an error.

Replace the error print with a debug level print so that we don't get
such prints when the underlying regulator doesn't support DRMS.
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -295,7 +295,7 @@ static int regulator_check_drms(struct regulator_dev *rdev)
 		return -ENODEV;
 	}
 	if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
-		rdev_err(rdev, "operation not allowed\n");
+		rdev_dbg(rdev, "operation not allowed\n");
 		return -EPERM;
 	}
 	return 0;