rockchip: px30: Enable CONFIG_RNG_ROCKCHIP

CONFIG_RNG_ROCKCHIP/CONFIG_DM_RNG is enabled.

Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/evb-px30_defconfig b/configs/evb-px30_defconfig
index b5ba75c..d2cf13e 100644
--- a/configs/evb-px30_defconfig
+++ b/configs/evb-px30_defconfig
@@ -85,6 +85,8 @@
 CONFIG_TPL_RAM=y
 CONFIG_ROCKCHIP_SDRAM_COMMON=y
 CONFIG_DM_RESET=y
+CONFIG_DM_RNG=y
+CONFIG_RNG_ROCKCHIP=y
 # CONFIG_SPECIFY_CONSOLE_INDEX is not set
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_DEBUG_UART_SKIP_INIT=y