[ARM] Move enable_irq and disable_irq to assembler.h

5d25ac038a broke VFP builds due to
enable_irq not being defined as an assembly macro.  Move it to
assembler.h so everyone can use it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/vfp/entry.S

@@ -18,6 +18,7 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/asm-offsets.h>
+#include <asm/assembler.h>
 #include <asm/vfpmacros.h>
 
 	.globl	do_vfp