power: qpnp-smbcharger: Add support for detecting damaged battery

Detect safety timer expired condition from charger and notify it to FG
through safety_timer_expired property. This can be used for PMi8952 V2.0
and future PMi chips. While at it, rename the safety-timeout irq to
wdog-timeout irq.

CRs-Fixed: 866074
Change-Id: I3a0f1f053a0038349bf5f704cf29eb5b84de2601
Signed-off-by: Chunmei Cai <ccai@codeaurora.org>