regulator: qpnp-amoled: Fix IBB load current threshold

commit 0a1de26d ("regulator: qpnp-amoled: Add set_load()
callback for IBB regulator") added set_load() in IBB regulator to
configure phase control. However, load current threshold is set
to 30 A instead of 30 mA. Fix it. Also, when load current is set
to 0, switch to auto dual phase as per hardware recommendation.

While at it, fix the indentation for related macro definitions.

Change-Id: I513b2436874b47f0856423eac8a6786651d1f8ba
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>