spmi-pmic-arb: Read irq status register before transaction

SPMI protocal irq status register bits are sticky bits which
may show the other EEs status. so read it before starting of
transaction and dump it at the time of issue to get exact
cause of issue.

Change-Id: I2d2faef1a28ac6827cecc53984a26a4fceaff4eb
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>