platform: msm: gpio-usbdetect: Report charger types in REAL_TYPE

Commit eca542a9 ("power: qpnp-smbcharger: Report charger types in
REAL_TYPE property") changes to use POWER_SUPPLY_PROP_REAL_TYPE
property to report charger types between charger driver and USB
driver, so change the same in this driver to make sure USB driver
could get the correct charger type notification.

Change-Id: Ia70e9a376a494c6c9d8905ff4017996eecc8d503
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>