arm64: defconfig: build snd_bcm2835 as module

Recently the VCHIQ driver which provides a kernel interface to the
BCM2835 VideoCore made a decent progress in staging. But the build
coverage is currently limited to bcm2835_defconfig (ARM 32 bit).
So build the most valueable driver which uses VCHIQ and enable
cinch audio support for Raspberry Pi on arm64.

Signed-off-by: Stefan Wahren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Florian Fainelli <[email protected]>

Author: lategoodbye

arch/arm64/configs/defconfig

@@ -1217,6 +1217,7 @@ CONFIG_STAGING=y
 CONFIG_STAGING_MEDIA=y
 CONFIG_VIDEO_MAX96712=m
 CONFIG_VIDEO_MESON_VDEC=m
+CONFIG_SND_BCM2835=m
 CONFIG_CHROME_PLATFORMS=y
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_I2C=y