stm32mon: add STM32F09X chip id
stm32mon: add STM32F09X chip id

Adds the support of STM32F09X with 256KB flash.

BUG=none
Test=manual
    Check stm32mon ChipID output:
      ChipID 0x442 : STM32F09x
      Bootloader v3.1, commands : 00 01 02 11 21 31 44 63 73 82 92
      Flash read unprotected.
      Waiting for the monitor startup ...Done.
      Flash write unprotected.
      Waiting for the monitor startup ...Done.
      Flash erased.
      Writing 262144 bytes at 0x08000000

Change-Id: Ied967716750820a335011f244aae5885c507360a
Signed-off-by: Rong Chang <3a05493f7adfb36d203f663b3bc2ba30e9d6284f@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/266972
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,fourier49/BIZ_EC,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,fourier49/BZ_DEV_EC,fourier49/BIZ_EC,coreboot/chrome-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,md5555/ec,fourier49/BIZ_EC,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,md5555/ec,coreboot/chrome-ec