Added configs required for dcp_rng driver

This commit adds configs required for using dcp_rng driver in imx6ull
defconfig files.

Signed-off-by: Kshitiz Varshney <kshitiz.varshney@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
diff --git a/configs/mx6ull_14x14_evk_defconfig b/configs/mx6ull_14x14_evk_defconfig
index 65db621..881bc27 100644
--- a/configs/mx6ull_14x14_evk_defconfig
+++ b/configs/mx6ull_14x14_evk_defconfig
@@ -65,3 +65,7 @@
 CONFIG_FSL_QSPI=y
 CONFIG_SOFT_SPI=y
 CONFIG_IMX_THERMAL=y
+CONFIG_ARCH_MISC_INIT=y
+CONFIG_DM_RNG=y
+CONFIG_CMD_RNG=y
+CONFIG_FSL_DCP_RNG=y