pinctrl: armada-37xx: propagate error from armada_37xx_pmx_set_by_name()

The regmap_update_bits() function can fail, so propagate its error
up to the stack instead of silently ignoring that.

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Link: https://lore.kernel.org/20250514-pinctrl-a37xx-fixes-v2-7-07e9ac1ab737@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>