feat(interrupts): add FFA_EL3_INTR_HANDLE support

This patch introduces initial support for FFA_EL3_INTR_HANDLE ABI.
This ABI allows SPMC to delegate Group0 secure interrupt handling to
EL3 firmware (SPMD).

Complete support for this ABI is added in upcoming patches.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I1a75cfe87029fc32a0e6ddbe36ae3fe195ff3d84
diff --git a/inc/vmapi/hf/ffa.h b/inc/vmapi/hf/ffa.h
index 5717aa6..c9b947c 100644
--- a/inc/vmapi/hf/ffa.h
+++ b/inc/vmapi/hf/ffa.h
@@ -84,6 +84,7 @@
 #define FFA_CONSOLE_LOG_32                  0x8400008A
 #define FFA_CONSOLE_LOG_64                  0xC400008A
 #define FFA_PARTITION_INFO_GET_REGS_64      0xC400008B
+#define FFA_EL3_INTR_HANDLE_32              0x8400008C
 
 /* FF-A error codes. */
 #define FFA_NOT_SUPPORTED      INT32_C(-1)