configs: stm32mp15: Enable random number generator(rng) device

Enable support for the rng device on the stm32mp15 configs.
Signed-off-by: NSughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>
Acked-by: NPatrick Delaunay <patrick.delaunay@st.com>

configs/stm32mp15_basic_defconfig

@@ -143,3 +143,5 @@ CONFIG_VIDEO_STM32_DSI=y
 CONFIG_VIDEO_STM32_MAX_XRES=1280
 CONFIG_VIDEO_STM32_MAX_YRES=800
 CONFIG_FDT_FIXUP_PARTITIONS=y
+CONFIG_DM_RNG=y
+CONFIG_RNG_STM32MP1=y

configs/stm32mp15_optee_defconfig

@@ -127,3 +127,5 @@ CONFIG_VIDEO_STM32_DSI=y
 CONFIG_VIDEO_STM32_MAX_XRES=1280
 CONFIG_VIDEO_STM32_MAX_YRES=800
 CONFIG_FDT_FIXUP_PARTITIONS=y
+CONFIG_DM_RNG=y
+CONFIG_RNG_STM32MP1=y

configs/stm32mp15_trusted_defconfig

@@ -126,3 +126,5 @@ CONFIG_VIDEO_STM32_DSI=y
 CONFIG_VIDEO_STM32_MAX_XRES=1280
 CONFIG_VIDEO_STM32_MAX_YRES=800
 CONFIG_FDT_FIXUP_PARTITIONS=y
+CONFIG_DM_RNG=y
+CONFIG_RNG_STM32MP1=y