extcon: sm5502: Add support new SM5502 extcon device driver

This patch add new SM5502 MUIC(Micro-USB Interface Controller) device by using
EXTCON subsystem. The extcon-sm5502 driver is capable of identifying the type
of the external power source and attached accessory. An external power sources,
such as Deticated Charger or a standard USB port, are able to charge the battery
in the smart phone via the connector.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

diff --cc drivers/extcon/Kconfig
Simple merge

diff --cc drivers/extcon/Makefile
Simple merge

diff --cc drivers/extcon/extcon-sm5502.c
Simple merge

diff --cc include/linux/extcon/sm5502.h
Simple merge