spmi: pmic-arb: add support for HW version 5

Add support for version 5 of the SPMI PMIC arbiter.  It utilizes
different offsets for registers than those found on version 3.
Also, the procedure to determine if writing and IRQ access is
allowed for a given PPID changes for version 5.

Change-Id: I12b5b11c6fe47b4becf668bcca0abadfef72b8df
CRs-Fixed: 1047281
Signed-off-by: David Collins <collinsd@codeaurora.org>