[media] ARM: multi_v7_defconfig: enable STMicroelectronics DELTA Support

Enables support of STMicroelectronics STiH4xx SoC series
DELTA multi-format video decoder V4L2 driver.

Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>