ARM: dts: msm: Add pinctrl configuration for SMB_STAT on Kona

GPIO 6 on PM8150B is connected to the STAT pin on SMB1390 on Kona
platforms. The STAT pin is active low and configured for interrupts
generated by SMB1390.

Change-Id: I29d9ccb81fb420842c0cb7e76d3dc91208573b45
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>