ARM: Add definition for monitor mode

<asm/ptrace.h> provides *_MODE definitions for the various processor
modes, but monitor mode was missing.

Add MON_MODE to avoid code using the hardcoded value.
Suggested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/include/uapi/asm/ptrace.h

@@ -53,6 +53,7 @@
 #endif
 #define FIQ_MODE	0x00000011
 #define IRQ_MODE	0x00000012
+#define MON_MODE	0x00000016
 #define ABT_MODE	0x00000017
 #define HYP_MODE	0x0000001a
 #define UND_MODE	0x0000001b