[ARM] Fix tosa build error

tosa.c references mdelay(), but was missing linux/delay.h

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/tosa.c b/arch/arm/mach-pxa/tosa.c
index afa223b..7152bc1 100644
--- a/arch/arm/mach-pxa/tosa.c
+++ b/arch/arm/mach-pxa/tosa.c
@@ -20,6 +20,7 @@
 #include <linux/interrupt.h>
 #include <linux/mmc/host.h>
 #include <linux/pm.h>
+#include <linux/delay.h>
 
 #include <asm/setup.h>
 #include <asm/memory.h>