power: qpnp-smbcharger: Release wakeup source on USB removal

If the DCP charger gets removed before the HVDCP detection work
is executed the wakeup source is left enabled. Fix this by
releasing the wakeup source unconditionally on USB removal.

CRs-Fixed: 1064563
Change-Id: Iab7239d178d845dc357995d069ec4c4d9d341166
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>