configs: j721e_*_evm_a72_defconfig: Enable config for setting mmc speed mode

Enable config for setting mmc speed mode from U-Boot command line.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
diff --git a/configs/j721e_hs_evm_a72_defconfig b/configs/j721e_hs_evm_a72_defconfig
index ae184b0..6479f9b 100644
--- a/configs/j721e_hs_evm_a72_defconfig
+++ b/configs/j721e_hs_evm_a72_defconfig
@@ -162,3 +162,4 @@
 CONFIG_CADENCE_UFS=y
 CONFIG_TI_J721E_UFS=y
 CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_MMC_SPEED_MODE_SET=y