arm: Add export.h to ARM specific files as required.

These files all make use of one of the EXPORT_SYMBOL variants
or the THIS_MODULE macro.  So they will need <linux/export.h>

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 94c78bc..2432a6b 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -33,6 +33,7 @@
 #include <linux/i2c.h>
 #include <linux/i2c-gpio.h>
 #include <linux/spi/spi.h>
+#include <linux/export.h>
 
 #include <mach/hardware.h>
 #include <mach/fb.h>