arm64: dts: meson-g12-common: add more pwm_f options

Add missing PWM_F pin muxing for GPIOA_11 and GPIOZ_12.

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220112211642.2248901-3-gary.bisson@boundarydevices.com