As we are getting short on SRAM and do not need that extensive UART
debugging support, let's reduce the UART TX buffer size to a standard
value of 512 bytes.
BRANCH=none
BUG=chrome-os-partner:58961
TEST=built and booted a new image. Verified that the cr50 console
connection is still operational.
Change-Id: Ieb77671cb144b9ea5073f5d3242c9e41e5d78883
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/418948
Reviewed-by: Mary Ruthven <mruthven@chromium.org>