power: pm8921-charger: disable AICL

There are certain conditions where AICL should be disabled. For example,
cases where a strong usb charger capable of supporting the usb_max_current
or cases where a wireless charger is used.

Use the power supply property HEALTH to indicate whether AICL is desired
or not. If HEALTH is unknown enable AICL, if HEALTH is good disable
AICL.

While at it clean up the vbus_draw callback
- there is no need of the vbus_lock, remove it
- there were , comma separated statements in the probe function, use ;
  instead
- the commit to verify the_chip is initialized, defeats the purpose of
  remembering the usb current when the_chip is not initialized. Clean
  this up

Change-Id: I8b21ccdf5ed69ea917cb370d2e8930c9d8a5003f
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>