ARM: multi_v7_defconfig: add Renesas DPCM Sound Card

This patch enables Renesas DPCM related sound card.
It is used for...
 - Sampline rate convert
 - CTU/MIXer

Note: you need to enable these settings on DTS file

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>