stm32: add missing init hook
stm32: add missing init hook

This adds a missing init hook

BUG=none
TEST=Tested on Snow

Change-Id: I4571d5bddf415b06e27e5e9eaadbb6017bde4bbe
Signed-off-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>

thehobn/ec,mtk09422/chromiumos-platform-ec,md5555/ec,mtk09422/chromiumos-platform-ec,mtk09422/chromiumos-platform-ec,gelraen/cros-ec,fourier49/BIZ_EC,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,coreboot/chrome-ec,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,coreboot/chrome-ec,fourier49/BIZ_EC,longsleep/ec,coreboot/chrome-ec,alterapraxisptyltd/chromium-ec,eatbyte/chromium-ec,longsleep/ec,thehobn/ec,alterapraxisptyltd/chromium-ec,thehobn/ec,mtk09422/chromiumos-platform-ec,gelraen/cros-ec,alterapraxisptyltd/chromium-ec,md5555/ec,fourier49/BZ_DEV_EC,eatbyte/chromium-ec,gelraen/cros-ec,alterapraxisptyltd/chromium-ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,fourier49/BZ_DEV_EC,longsleep/ec,gelraen/cros-ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,fourier49/BIZ_EC,thehobn/ec,md5555/ec,coreboot/chrome-ec,eatbyte/chromium-ec