power: smb1390: Add cp_irq and toggle_switcher property

Currently to prevent SMB1390 from getting stuck in disabled
state on IREV IRQ, switcher is toggled. As an optimization to
this workaround, voltage needs to be increment first before
switcher toggling to break the latching of IREV IRQ status
on WIN_UV.

Add cp_irq and toggle_switcher property to allow userspace
daemon to increment the voltage and initiate the switcher
toggle.

Change-Id: I11fbc5877a2df9ce4d0208c698b8758adae1d035
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>