FROMLIST: drivers/pinmux/stm32: add/fix pinmux for F103xG

* Add missing the PINMUX macros for UART5 pins.
* Correct a typo in STM32F1_PINMUX_FUNC_PC5_ADC12_IN15; the macro
used PC4 instead of PC5 for ADC12_IN15.

BUG=b:168351018
TEST=build chameleon

Change-Id: Iee22908f672e5eff56408e047297e3e8bb27dcd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/2412670
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: Paul Fagerburg <pfagerburg@chromium.org>
1 file changed