power: qpnp-smbcharger: don't call parallel enable directly

The FCC setting code, tries to enable parallel charger by calling
smbchg_parallel_usb_enable();

Instead change it to go through the smbchg_parallel_usb_check_ok()
api.

Change-Id: I672e0cf63f8dade94b799935fa7e183fb966a7b7
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>