mfd: pm8921-core: Add support for a newly defined PMIC PM8917 regulator

Add support for the new LDO regulator which was recently added to
the design of the PMIC PM8917.  LDO 36 is a 50 mA PMOS LDO.

Overall regulator changes between PMIC PM8921 and PMIC PM8917:
PM8917 adds:    7 PMOS LDOs (L30-L36) and 1 boost regulator
PM8917 removes: negative charge pump (NCP), HDMI medium voltage
		switch (MVS), and low voltage switch (LVS) 2

Support for other PM8917 regulators differences was been added in
a previous change.

Change-Id: I634c366d418d682f0cf3a3d8bc270063f7aee3cd
Signed-off-by: David Collins <collinsd@codeaurora.org>