imx: mx6: use simpler runtime cpu dection macros

Use simpler runtime cpu dection macros.
i.MX6DL and i.MX6SOLO work the same, so use is_mx6sdl.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c
index 1e7ae28..3cc8666 100644
--- a/arch/arm/cpu/armv7/mx6/ddr.c
+++ b/arch/arm/cpu/armv7/mx6/ddr.c
@@ -888,8 +888,7 @@
 #define MR(val, ba, cmd, cs1) \
 	((val << 16) | (1 << 15) | (cmd << 4) | (cs1 << 3) | ba)
 #define MMDC1(entry, value) do {					  \
-	if (!is_cpu_type(MXC_CPU_MX6SX) && !is_cpu_type(MXC_CPU_MX6UL) && \
-	    !is_cpu_type(MXC_CPU_MX6SL))				  \
+	if (!is_mx6sx() && !is_mx6ul() && !is_mx6sl())			  \
 		mmdc1->entry = value;					  \
 	} while (0)
 
@@ -1197,12 +1196,11 @@
 	u16 mem_speed = ddr3_cfg->mem_speed;
 
 	mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
-	if (!is_cpu_type(MXC_CPU_MX6SX) && !is_cpu_type(MXC_CPU_MX6UL) &&
-	    !is_cpu_type(MXC_CPU_MX6SL))
+	if (!is_mx6sx() && !is_mx6ul() && !is_mx6sl())
 		mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;
 
 	/* Limit mem_speed for MX6D/MX6Q */
-	if (is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) {
+	if (is_mx6dq()) {
 		if (mem_speed > 1066)
 			mem_speed = 1066; /* 1066 MT/s */
 
@@ -1221,7 +1219,7 @@
 	 * Data rate of 1066 MT/s requires 533 MHz DDR3 clock, but MX6D/Q supports
 	 * up to 528 MHz, so reduce the clock to fit chip specs
 	 */
-	if (is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) {
+	if (is_mx6dq()) {
 		if (clock > 528)
 			clock = 528; /* 528 MHz */
 	}