ARM: dts: msm: Add current property for flash-led for pmicobalt

Add the qcom,current-ma property which is used to specify the
default current value to be used for the flash and torch devices.
This property is used by clients of the flash device.

CRs-Fixed: 1024187
Change-Id: I3670eaa65efc9d1efb29fb30500fb9067885b446
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>