GIC: Add APIs to enable and disable interrupt

API documentation updated.

Change-Id: Ice7511f8df5356851001d2f7dc2a46cfe318f9ba
Co-authored-by: Yousuf A <yousuf.sait@arm.com>
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index e4fb6a9..671aa61 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -77,6 +77,8 @@
 int plat_ic_is_ppi(unsigned int id);
 int plat_ic_is_sgi(unsigned int id);
 unsigned int plat_ic_get_interrupt_active(unsigned int id);
+void plat_ic_disable_interrupt(unsigned int id);
+void plat_ic_enable_interrupt(unsigned int id);
 
 /*******************************************************************************
  * Optional common functions (may be overridden)