power: smb5: Fix IRQ storm due to WDOG SNARL IRQ

Currently, SNARL WDOG IRQ is required only for SW Thermal Regulation
WA. But, the default enablement of WDOG SNARL IRQ during initialization
results in irq storm.

Fix irq storm issue, by disabling WDOG SNARL IRQ by default.

Change-Id: I7aa40c098c3c5c68174bb11568f71e5fff2e2096
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>