defconfig: lahaina: Disable console on GKI builds

When serial driver is present in second stage ramdisk, it takes ~5 sec to
init the UART. All the data bufferred till then will have to be put onto
the console taking a console lock and this causes a watchdog bark. To
avoid this watchdog issue, disable the console. This also disables early
console.

Change-Id: Ibded81922cb735e3035fc960258213c4de1d6a74
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>