ARM: configs: at91: sama5: Add audio MIKROE PROTO board

Add this board as a module as it's useful for testing audio on multiple
AT91 boards.
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
[nicolas.ferre@microchip.com: adap to newer kernel]
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

arch/arm/configs/sama5_defconfig

@@ -170,6 +170,7 @@ CONFIG_SND_ATMEL_SOC_CLASSD=y
 CONFIG_SND_ATMEL_SOC_PDMIC=y
 CONFIG_SND_ATMEL_SOC_TSE850_PCM5142=m
 CONFIG_SND_ATMEL_SOC_I2S=y
+CONFIG_SND_SOC_MIKROE_PROTO=m
 # CONFIG_HID_GENERIC is not set
 CONFIG_USB=y
 CONFIG_USB_ANNOUNCE_NEW_DEVICES=y