ARM: at91/defconfig: at91_dt: Add driver for Audio PROTO board

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
[claudiu.beznea@microchip.com: set it as module]
Singed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Author: Codrin Ciubotariu

arch/arm/configs/at91_dt_defconfig

@@ -186,6 +186,7 @@ CONFIG_SND_ATMEL_SOC=y
 CONFIG_SND_AT91_SOC_SAM9G20_WM8731=y
 CONFIG_SND_ATMEL_SOC_WM8904=y
 CONFIG_SND_AT91_SOC_SAM9X5_WM8731=y
+CONFIG_SND_SOC_MIKROE_PROTO=m
 CONFIG_SND_MCHP_SOC_I2S_MCC=y
 CONFIG_USB=y
 CONFIG_USB_ANNOUNCE_NEW_DEVICES=y