[INKA4x0] NG hardware: SDRAM support

Add support for three new DDR chips that may  be present on a NG
INKA4x0 hardware: HYB25D512160BF-5, K4H511638C-7CB3, T46V32M16BN-6IT.

Cleanup board/inka4x0/mt48lc16m16a2-75.h file.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/board/inka4x0/mt48lc16m16a2-75.h b/board/inka4x0/mt48lc16m16a2-75.h
index 13a97ac..1547725 100644
--- a/board/inka4x0/mt48lc16m16a2-75.h
+++ b/board/inka4x0/mt48lc16m16a2-75.h
@@ -21,27 +21,10 @@
  * MA 02111-1307 USA
  */
 
-#define SDRAM_DDR	1		/* is SDR */
+#define SDRAM_DDR	0		/* is SDR */
 
-#if defined(CONFIG_MPC5200)
 /* Settings for XLB = 132 MHz */
 #define SDRAM_MODE	0x00CD0000
-/* #define SDRAM_MODE	0x008D0000 */ /* CAS latency 2 */
 #define SDRAM_CONTROL	0x504F0000
 #define SDRAM_CONFIG1	0xD2322800
-/* #define SDRAM_CONFIG1	0xD2222800 */ /* CAS latency 2 */
-/*#define SDRAM_CONFIG1	0xD7322800 */ /* SDRAM controller bug workaround */
 #define SDRAM_CONFIG2	0x8AD70000
-/*#define SDRAM_CONFIG2	0xDDD70000 */ /* SDRAM controller bug workaround */
-
-#elif defined(CONFIG_MGT5100)
-/* Settings for XLB = 66 MHz */
-#define SDRAM_MODE	0x008D0000
-#define SDRAM_CONTROL	0x504F0000
-#define SDRAM_CONFIG1	0xC2222600
-#define SDRAM_CONFIG2	0x88B70004
-#define SDRAM_ADDRSEL	0x02000000
-
-#else
-#error Neither CONFIG_MPC5200 or CONFIG_MGT5100 defined
-#endif