ARM: dts: msm: Fix smb1390 stat interrupt configuration on sm8150 platforms

SMB1390 stat interrupt needs to be configured properly so that
the active low interrupt can happen only when the device pulls it
low. Fix it.

While at it, keep the parent device (smb1390) of smb1390_charger
disabled in smb1390.dtsi so that it can be enabled only where the
smb1390_charger device is enabled.

Change-Id: I5d0c60ca7843d6f6f6328f4fd036d07ab5df6093
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>