power: smb-lib: Rearrange BOOST_BACK voting logic

The BOOST_BACK USB-ICL voter needs to be removed in the
following conditions -

1. VBUS falling path during PD hard-reset
2. typeC removal
3. False boost-back detected

For (1) and (2) - remove the boost_back vote in the usbin_handler
and typec_removal path. For (3) add a worker which removes the
boost_back vote after the boost-back condition is detected. The
delay is sufficient to recover from both a valid and an incorrectly
detected boost-back condition.

CRs-Fixed: 2051908
Change-Id: I9d1d04f392bb6040b0565510ff7d1032bb036de2
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>