ARM: imx_v6_v7_defconfig: Select the wm8960 codec driver

Select CONFIG_SND_SOC_WM8960 so that we can have audio functional
by default on imx6ul-evk and imx7-sdb boards.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -262,6 +262,7 @@ CONFIG_SND_SOC_IMX_MC13783=y
 CONFIG_SND_SOC_FSL_ASOC_CARD=y
 CONFIG_SND_SOC_CS42XX8_I2C=y
 CONFIG_SND_SOC_TLV320AIC3X=y
+CONFIG_SND_SOC_WM8960=y
 CONFIG_SND_SIMPLE_CARD=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y