pinctrl: meson-g12a: add pwm_a on GPIOE_2 pinmux

Add the missing pinmux for the pwm_a function on the GPIOE_2 pin.

Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20190729125838.6498-1-narmstrong@baylibre.com


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