Add stm32mon support for STM32F37xx
Add stm32mon support for STM32F37xx

This is needed for the new Ryu boards.

BRANCH=none
BUG=chrome-os-partner:32660
TEST=Program STM32F373 chip.

Change-Id: Ib7a58826945090300b7e086e888c43c46fb499ab
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/223893
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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