OMAP3:SDRC: introduce DDR types

Micron DDR timings based on:
http://www.sakoman.net/cgi-bin/gitweb.cgi?p=x-load-omap3.git;a=blob;f=include/asm/arch-omap3/mem.h;h=e6fbfe3947f5d0d85fea776e30821d4017316d86;hb=HEAD

Introduce Micron DDR timings and provide
CONFIG_OMAP3_INFINEON_DDR and CONFIG_OMAP3_MICRON_DDR config
options to allow for platform files to setup their timings as
per the type of DDR selected

Reported-by: Steve Sakoman in http://www.nabble.com/forum/Permalink.jtp?root=25779518&post=25959734&page=y

Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/include/configs/omap3_sdp3430.h b/include/configs/omap3_sdp3430.h
index 229dc5e..d91c8ff 100644
--- a/include/configs/omap3_sdp3430.h
+++ b/include/configs/omap3_sdp3430.h
@@ -137,6 +137,9 @@
 #define CONFIG_SYS_I2C_BUS_SELECT	1
 #define CONFIG_DRIVER_OMAP34XX_I2C	1
 
+/* DDR - I use Infineon DDR */
+#define CONFIG_OMAP3_INFINEON_DDR	1
+
 /* OMITTED:  single 1 Gbit MT29F1G NAND flash */
 
 /*