ARM: OMAP2+: Fix L4_EMU_34XX_BASE error after iomap changes

With the introduction of iomap changes platform init code
fails for emu.c if CONFIG_OMAP3_EMU is selected:

arch/arm/mach-omap2/emu.c:35:8: error:
'L4_EMU_34XX_BASE' undeclared here (not in a function)
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/emu.c

@@ -21,6 +21,8 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 
+#include <mach/hardware.h>
+
 #include "iomap.h"
 
 MODULE_LICENSE("GPL");