android: configs: base: enable Android gadget functions

F_FS            for ADB
F_MTP/PTP       for MTP/PTP
F_ACC           for Android USB Accessory
F_AUDIO_SRC     for USB Audio Source
CONFIGFS_UEVENT for communicating USB state change notifications to userspace

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>