block: dwc_ahsata: support i.MX6DQPlus

i.MX6DQPlus support sata interface, so not return failure
when CPU is i.MX6DQPlus.

In this patch, also use simpler runtime cpu dections macros to replace
is_cpu_type.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tang Yuantian <Yuantian.Tang@freescale.com>
Cc: Shaohui Xie <Shaohui.Xie@freescale.com>
Cc: Bin Meng <bmeng.cn@gmail.com>

drivers/block/dwc_ahsata.c

@@ -563,7 +563,7 @@ int init_sata(int dev)
 	struct ahci_probe_ent *probe_ent = NULL;
 
 #if defined(CONFIG_MX6)
-	if (!is_cpu_type(MXC_CPU_MX6Q) && !is_cpu_type(MXC_CPU_MX6D))
+	if (!is_mx6dq() && !is_mx6dqp())
 		return 1;
 #endif
 	if (dev < 0 || dev > (CONFIG_SYS_SATA_MAX_DEVICE - 1)) {