This patch synchronizes tizen defconfig with savedefconfig as getting
rid of CONFIG_EXTCON which is not included in savedefconfig, but
selected by CONFIG_USB_DWC2_EXTCON_NOTIFY.
Change-Id: Ie3eb5dab252c9fa0fe9d1a499ef460a85dfe84d6 Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>