power: qpnp-charger: wake up upon fast charge after resuming

When state of charge based charge resume happens there is
a delay between enabling charging again in hardware and
the fast charge state being reached. During this time
the system may have gone to suspend and the necessary
information is not conveyed to userspace.

Fix this by enabling the fast charge interrupt as a
wakeup interrupt when the SOC based resume event occurs.
Disable it when within the fast charge interrupt handler.

Change-Id: I286b1c12dbf057de974afb4084d92c157f08eee4
CRs-Fixed: 606012
Signed-off-by: David Keitel <dkeitel@codeaurora.org>