Reload watchdog timer during flash operations.
Reload watchdog timer during flash operations.

Signed-off-by: Randall Spangler <rspangler@chromium.org>

BUG=chrome-os-partner:8967
TEST=manual

While ssh'd into the device:

1) Create a test image:

Extracting to: /tmp/ecup

132+1 records in
132+1 records out
136132 bytes (136 kB) copied, 0.000550122 s, 247 MB/s

2) Force the EC into its RO image:

done.

3) Erase the A and B images, then reprogram them:

Erasing 163840 bytes at offset 81920...
done.

Reading 136132 bytes from /home/chronos/user/ecb.bin...
Writing to offset 81920...
done.

4) Repeat step 3 about 10 times while monitoring the EC debug console.
Commands should complete successfully all the time.  (Note that during
the flashwrite, there's a ton of debug output; what you should NOT see
is something like this:
   WATCHDOG PC=00002104 / LR=0000597f / pSP=200013a0

Change-Id: I2f1f05eb19abcd6e19c6364f6d4ac785cca6a4c6

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