ARM: omap3_beagle: Remove non-DM initialization

With DM_MMC working for both SPL and U-Boot, this patch removes
the legacy style of initializing the MMC driver.

Based on omap3_logic: 42140dd096.

Signed-off-by: Romain Naour <romain.naour@gmail.com>

board/ti/beagle/beagle.c

@@ -500,13 +500,6 @@ void set_muxconf_regs(void)
 	MUX_BEAGLE();
 }
 
-#if defined(CONFIG_MMC)
-int board_mmc_init(struct bd_info *bis)
-{
-	return omap_mmc_init(0, 0, 0, -1, -1);
-}
-#endif
-
 #if defined(CONFIG_MMC)
 void board_mmc_power_init(void)
 {