plat/arm/board/arm_fpga: Initialize the Generic Interrupt Controller

This initializes the GIC using the Arm GIC drivers in TF-A.
The initial FPGA image uses a GIC600 implementation, and so that its
power controller is enabled, this platform port calls the corresponding
implementation-specific routines.

Signed-off-by: Oliver Swede <oli.swede@arm.com>
Change-Id: I88d5a073eead4b653b1ca73273182cd98a95e4c5
diff --git a/plat/arm/board/arm_fpga/fpga_private.h b/plat/arm/board/arm_fpga/fpga_private.h
index 28aaef2..7545bd1 100644
--- a/plat/arm/board/arm_fpga/fpga_private.h
+++ b/plat/arm/board/arm_fpga/fpga_private.h
@@ -11,4 +11,8 @@
 
 void fpga_console_init(void);
 
+void plat_fpga_gic_init(void);
+void fpga_pwr_gic_on_finish(void);
+void fpga_pwr_gic_off(void);
+
 #endif