ARM: 7188/1: OMAP2PLUS: Fix build error: 'omap2/omap3_intc_handle_irq' undeclared.

Fix the build break by adding the necessary irq functions to
common header.
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap2/common.h

@@ -153,6 +153,8 @@ void omap_intc_restore_context(void);
 void omap3_intc_suspend(void);
 void omap3_intc_prepare_idle(void);
 void omap3_intc_resume_idle(void);
+void omap2_intc_handle_irq(struct pt_regs *regs);
+void omap3_intc_handle_irq(struct pt_regs *regs);
 
 /*
  * wfi used in low power code. Directly opcode is used instead