arm64: configs: rockchip_defconfig: enable pdm interface

Change-Id: I3d6b75d3e08bf542e8b0da014fd4a6b263fac124
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>

Author: Sugar Zhang

arch/arm64/configs/rockchip_defconfig

@@ -545,6 +545,7 @@ CONFIG_SND_VERBOSE_PRINTK=y
 CONFIG_SND_USB_AUDIO=y
 CONFIG_SND_SOC=y
 CONFIG_SND_SOC_ROCKCHIP=y
+CONFIG_SND_SOC_ROCKCHIP_PDM=y
 CONFIG_SND_SOC_ROCKCHIP_SPDIF=y
 CONFIG_SND_SOC_ROCKCHIP_HDMI_ANALOG=y
 CONFIG_SND_SOC_ROCKCHIP_HDMI_DP=y