board: tbs2910: Fix eMMC BOOTCFG value

Fix the BOOTCFG value for eMMC in the same way as commit
  214c3f0f9921250eb336c7effadcc16158ea9df5
  [imx: MX6DQ{P}/DL:SABRESD Fix bmode eMMC failure]
did for sabresd.

Signed-off-by: Soeren Moch <smoch@web.de>

board/tbs/tbs2910/tbs2910.c

@@ -378,7 +378,7 @@ static const struct boot_mode board_boot_modes[] = {
 	{"sd2",	 MAKE_CFGVAL(0x40, 0x28, 0x00, 0x00)},
 	{"sd3",	 MAKE_CFGVAL(0x40, 0x30, 0x00, 0x00)},
 	/* 8 bit bus width */
-	{"emmc", MAKE_CFGVAL(0x40, 0x38, 0x00, 0x00)},
+	{"emmc", MAKE_CFGVAL(0x60, 0x58, 0x00, 0x00)},
 	{NULL,	 0},
 };
 #endif