arm64: defconfig: Enable wm8960 audio driver.

This driver is used by the Nitrogen8m Mini SBC.
Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -764,6 +764,7 @@ CONFIG_SND_SOC_SIMPLE_MUX=m
 CONFIG_SND_SOC_TAS571X=m
 CONFIG_SND_SOC_WCD934X=m
 CONFIG_SND_SOC_WM8904=m
+CONFIG_SND_SOC_WM8960=m
 CONFIG_SND_SOC_WM8962=m
 CONFIG_SND_SOC_WSA881X=m
 CONFIG_SND_SOC_LPASS_WSA_MACRO=m