Convert CONFIG_HSMMC2_8BIT to Kconfig

This converts the following to Kconfig:
   CONFIG_HSMMC2_8BIT

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cm_t43_defconfig b/configs/cm_t43_defconfig
index 867ca30..6eda33e 100644
--- a/configs/cm_t43_defconfig
+++ b/configs/cm_t43_defconfig
@@ -76,6 +76,7 @@
 CONFIG_SYS_I2C_LEGACY=y
 CONFIG_SPL_SYS_I2C_LEGACY=y
 CONFIG_MMC_OMAP_HS=y
+CONFIG_HSMMC2_8BIT=y
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_SYS_NAND_ONFI_DETECTION=y