target/Config.in.arch: really provide correct --with-arch= for ARM targets

The ARM arch names are armVx, not armX

target/Config.in.arch

@@ -656,19 +656,19 @@ config BR2_GCC_TARGET_ARCH
 	default c3		if BR2_x86_c3
 	default geode		if BR2_x86_geode
 	default armv4t		if BR2_arm7tdmi
-	default arm3		if BR2_arm610
-	default arm3		if BR2_arm710
-	default arm4t		if BR2_arm720t
-	default arm4t		if BR2_arm920t
-	default arm4t		if BR2_arm922t
-	default arm4t		if BR2_arm926t
-	default arm5t		if BR2_arm10t
-	default arm6j		if BR2_arm1136jf_s
-	default arm6zk		if BR2_arm1176jz_s
-	default arm6zk		if BR2_arm1176jzf_s
-	default arm4		if BR2_sa110
-	default arm4		if BR2_sa1100
-	default arm5te		if BR2_xscale
+	default armv3		if BR2_arm610
+	default armv3		if BR2_arm710
+	default armv4t		if BR2_arm720t
+	default armv4t		if BR2_arm920t
+	default armv4t		if BR2_arm922t
+	default armv4t		if BR2_arm926t
+	default armv5t		if BR2_arm10t
+	default armv6j		if BR2_arm1136jf_s
+	default armv6zk		if BR2_arm1176jz_s
+	default armv6zk		if BR2_arm1176jzf_s
+	default armv4		if BR2_sa110
+	default armv4		if BR2_sa1100
+	default armv5te		if BR2_xscale
 	default iwmmxt		if BR2_iwmmxt
 	default v0		if BR2_cris_unknown
 	default v10		if BR2_cris_generic