twl4030_charger: Allow charger to control the regulator that feeds it

The charger needs usb3v1 to be running, so add a new consumer to
keep it running.

This allows the charger to draw current even when the USB driver has
powered down.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>