soc: qcom: Add generic irq handler for secure processor

This patch adds the code to handle watchdog, err_ready and other
interrupts from secure processor subsystem to the PIL driver.

CRs-Fixed: 972423
Change-Id: I65455229ee14bd4da357358ac3977f2137f3c07e
Signed-off-by: Puja Gupta <pujag@codeaurora.org>