power: smb135x-charger: Disable the charge-inhibit IRQ reporting

It is observed that when charging is in hold-off (i.e. not charging
due to various conditions such as battery cold/hot) and VBATT nears
VFLOAT, the SMB chip generates a storm of charge-inhibit
IRQs even though there are no usb/dc insertions.

Disable the charge-inhibit IRQ reporting to avoid this IRQ storm,
until this is fixed in the hardware.

Note - this does not disable the charge-inhibit functionality and
the real-time status of this IRQ (if changed) is handled whenever
the src_detect IRQ triggers.

Change-Id: I4054bd1760c6e08adb5cbad8fd0ec1cb8da14421
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>