drivers: irqchip: pdc: Add QTI SOC interrupt controller

Implement QTI SOC interrupt controller for configuring interrupts to
wakeup APSS from system sleep. Use hierarchical interrupt domain
framework as the arch-extension are no longer supported.

This is a snapshot as of commit 741a37a6166a ("drivers: irqchip: pdc:
Add QTI SOC interrupt controller").

Change-Id: I8a6ad64ac76ae1758dc3da84abad5d67f92106ab
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>