power: qpnp-fg-gen3: Use votable for controlling delta_bsoc irq

power: qpnp-fg-gen3: Use votable for controlling delta_bsoc irq

Instead of using a flag to retain the interrupt enabled status
of delta_bsoc interrupt, switch it to use a votable instead. This
improves the readability of code by not worrying about the flag.

While at it, fix cleaning up the resources in some error paths
during driver probe.

Change-Id: I2c17a9d90c7b549435caa75da81f4c4779ea3344
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>