RT80404. SF2 DDR: disable DDR Bridge buffering

We suspect some BUG in the buffering scheme. See RT records for
details.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>

board/emcraft/m2s-som/board.c

@@ -112,6 +112,13 @@ int dram_init (void)
 	 */
 	M2S_SYSREG->mddr_cr = (1 << 0);
 
+	/*
+	 * Disable all DDR Bridge buffers
+	 * We suspect some bug in the buffering scheme, so disable
+	 * this for now
+	 */
+	M2S_SYSREG->ddrb_cr = 0;
+
 	/*
 	 * Configure mode, and mapping:
 	 * - LPDDR1 + PHY-16 + ECC_DISABLE