arm/imx: add gic_handle_irq function

This is a plain translation of assembly gic irq handler to C function
for CONFIG_MULTI_IRQ_HANDLER support on imx family.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index ace4bb5..c225837 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -86,6 +86,7 @@
 
 void avic_handle_irq(struct pt_regs *);
 void tzic_handle_irq(struct pt_regs *);
+void gic_handle_irq(struct pt_regs *);
 
 #define imx1_handle_irq avic_handle_irq
 #define imx21_handle_irq avic_handle_irq
@@ -96,5 +97,6 @@
 #define imx50_handle_irq tzic_handle_irq
 #define imx51_handle_irq tzic_handle_irq
 #define imx53_handle_irq tzic_handle_irq
+#define imx6q_handle_irq gic_handle_irq
 
 #endif