i.MX6: Add convenience macros cpu_type(rev) and is_cpu_type(cpu)

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mx6/sys_proto.h

@@ -19,6 +19,13 @@
 
 #define is_soc_rev(rev)	((get_cpu_rev() & 0xFF) - rev)
 u32 get_cpu_rev(void);
+
+/* returns MXC_CPU_ value */
+#define cpu_type(rev) (((rev) >> 12)&0xff)
+
+/* use with MXC_CPU_ constants */
+#define is_cpu_type(cpu) (cpu_type(get_cpu_rev()) == cpu)
+
 const char *get_imx_type(u32 imxtype);
 unsigned imx_ddr_size(void);