[PATCH] ARM: OMAP: Disable DEBUG_LL in omap_h3_1710_defconfig

Some folks have reported "serial console corruption" issues when using
the current omap_h3_1710_defconfig due to CONFIG_DEBUG_LL=y. This patch
disables CONFIG_DEBUG_LL since it's rarely required and only serves to
confuse some folks when they observe "serial console corruption"
while using the defconfig.