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/doc/README.mx28evk b/doc/README.mx28evk
index 571dfda..2fc5069 100644
--- a/doc/README.mx28evk
+++ b/doc/README.mx28evk
@@ -6,8 +6,8 @@
 Files of the MX28EVK port
 --------------------------
 
-arch/arm/cpu/arm926ejs/mx28/	- The CPU support code for the Freescale i.MX28
-arch/arm/include/asm/arch-mx28/	- Header files for the Freescale i.MX28
+arch/arm/cpu/arm926ejs/mxs/	- The CPU support code for the Freescale i.MX28
+arch/arm/include/asm/arch-mxs/	- Header files for the Freescale i.MX28
 board/freescale/mx28evk/	- MX28EVK board specific files
 include/configs/mx28evk.h	- MX28EVK configuration file