[ARM] lart: fix build error

arch/arm/mach-sa1100/lart.c:36: error: 'PAGE_SHIFT' undeclared here (not in a function)
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/lart.c

@@ -9,6 +9,7 @@
 #include <mach/hardware.h>
 #include <asm/setup.h>
 #include <asm/mach-types.h>
+#include <asm/page.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>