spmi-pmic-arb: correct bad irq debug dump

Incorrect debug dump includes: printing SID value
always as zero, showing inactive mapping table
entries, and dumping valid bit which corrupts the
mapping table values.

Change-Id: Ica74afa501fc733b5b35f8ff812375695a6e5f4b
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>