mx25: add CPU revision 1.2

tested on a MCIMX257CJM4A which now reports :
CPU:   Freescale i.MX25 rev1.2 at 399 MHz

Signed-off-by: Eric Bénard <eric@eukrea.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>

arch/arm/cpu/arm926ejs/mx25/generic.c

@@ -140,6 +140,9 @@ u32 get_cpu_rev(void)
 	case 0x01:
 		system_rev |= CHIP_REV_1_1;
 		break;
+	case 0x02:
+		system_rev |= CHIP_REV_1_2;
+		break;
 	default:
 		system_rev |= 0x8000;
 		break;

arch/arm/include/asm/arch-mx25/imx-regs.h

@@ -357,5 +357,6 @@ struct aips_regs {
 
 #define CHIP_REV_1_0		0x10
 #define CHIP_REV_1_1		0x11
+#define CHIP_REV_1_2		0x12
 
 #endif				/* _IMX_REGS_H */