GIC: Add API to set priority mask

API documentation updated.

Change-Id: I40feec1fe67a960d035061b54dd55610bc34ce1d
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index ab5d68e..f03a399 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -87,6 +87,7 @@
 		u_register_t mpidr);
 void plat_ic_set_interrupt_pending(unsigned int id);
 void plat_ic_clear_interrupt_pending(unsigned int id);
+unsigned int plat_ic_set_priority_mask(unsigned int mask);
 
 /*******************************************************************************
  * Optional common functions (may be overridden)