soc: qcom: irq-helper: Add header file of irq-helper

Add header file of irq-helper to export black_list on/off api to
other module.

CRs-Fixed: 1051104
Change-Id: I4737975961b18f1095e3cd78d07a2bca22931291
Signed-off-by: Runmin Wang <runminw@codeaurora.org>