defconfig: lahaina: remove CONFIG_LEDS_CLASS_FLASH & CONFIG_LEDS_TRIGGER_TIMER

Now that CONFIG_LEDS_CLASS_FLASH and CONFIG_LEDS_TRIGGER_TIMER
are enabled in gki_defconfig, remove them from lahaina_GKI.config
so that those modules gets updates from ACK.

Change-Id: Ie913c96eac0453b386fcee1d8a167da6da233e1c
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>