Trogdor: Enlarge UART TX buffer
Trogdor: Enlarge UART TX buffer

Increase console output buffer since we have the RAM available.
It helps console message drop/corruption.

BRANCH=None
BUG=None
TEST=Enabled i2ctrace which dumps lots of messages.

Change-Id: Icd98d429ec80cdae1d8970624a1c4c385ef73184
Signed-off-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2464232
Reviewed-by: Alexandru M Stan <1784cbba6d7675b1eba55eaefe41c7672ad9da3b@chromium.org>
Commit-Queue: Alexandru M Stan <1784cbba6d7675b1eba55eaefe41c7672ad9da3b@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec