mxs: reorganize source directory for easy sharing of code in i.MXS SoCs

Most code can be shared between i.MX23 and i.MX28 as both are from
i.MXS family; this source directory structure makes easy to share code
among them.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index 3ee538a..f5cbbf3 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -47,8 +47,8 @@
  */
 #define	CONFIG_SPL
 #define	CONFIG_SPL_NO_CPU_SUPPORT_CODE
-#define	CONFIG_SPL_START_S_PATH		"arch/arm/cpu/arm926ejs/mx28"
-#define	CONFIG_SPL_LDSCRIPT	"arch/arm/cpu/arm926ejs/mx28/u-boot-spl.lds"
+#define	CONFIG_SPL_START_S_PATH		"arch/arm/cpu/arm926ejs/mxs"
+#define	CONFIG_SPL_LDSCRIPT	"arch/arm/cpu/arm926ejs/mxs/u-boot-spl.lds"
 #define	CONFIG_SPL_LIBCOMMON_SUPPORT
 #define	CONFIG_SPL_LIBGENERIC_SUPPORT
 #define	CONFIG_SPL_GPIO_SUPPORT