ARM: OMAP4: hsmmc: configure SDMMC1_DR0 properly

Fix the typo, instead it should be SDMMC1
USBC1 is not related to MMC1 I/Os

Change-Id: Icf99d8c9d4eb01ab803cb43a63a623812246da9c
Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Viswanath Puttagunta <vishp@ti.com>