ARM: imx_v6_v7_defconfig: Select the es8328 codec driver

Select CONFIG_SND_SOC_ES8328 so that we can have audio functional
by default on Kosagi Novena boards.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>