pm: demote several noisy logs to verbose

A lot of logging in pm is noisy, either give excessive information
that is given immediately by the preceding/succeding functions, or
just in high frequency within a short time. Demote those to verbose
level logging.

Additionally, also add BTM_PM_STS_PENDING to the pm status handler
even though it does nothing, because otherwise it would be logged as
an error, but it's just noisy.

Bug: 343276940, 335065189
Test: m -j
Flag: EXEMPT, logging only changes
Change-Id: If10c59a93301934db990b28564f7bd502954e13e