Fix a bug that a line longer than 80 char kills EC console
Fix a bug that a line longer than 80 char kills EC console

BUG=chrome-os-partner:11938
TEST=Type a command longer than 80 char and press enter. Check console
is still alive.

Change-Id: Ib86c5f97cc12220ac62ab8855ef8e5c65ecd2d82
Reviewed-on: https://gerrit.chromium.org/gerrit/28679
Reviewed-by: Charlie Mooney <c4f45ade001857f07012a75265a97cb07f1531f2@chromium.org>
Tested-by: Charlie Mooney <c4f45ade001857f07012a75265a97cb07f1531f2@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Commit-Ready: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Tested-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>

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