arm64: defconfig: enable RTC and audio support on Kontron sl28 boards

Although the Kontron SMARC-sAL28 board is now supported, there is still
missing driver support for the hardware clock, audio interface and audio
codec. Let's enable them as modules (where possible).
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -654,6 +654,7 @@ CONFIG_SND_HDA_TEGRA=m
 CONFIG_SND_HDA_CODEC_HDMI=m
 CONFIG_SND_SOC=y
 CONFIG_SND_BCM2835_SOC_I2S=m
+CONFIG_SND_SOC_FSL_SAI=m
 CONFIG_SND_MESON_AXG_SOUND_CARD=m
 CONFIG_SND_MESON_GX_SOUND_CARD=m
 CONFIG_SND_SOC_SDM845=m
@@ -671,6 +672,7 @@ CONFIG_SND_SOC_PCM3168A_I2C=m
 CONFIG_SND_SOC_SIMPLE_AMPLIFIER=m
 CONFIG_SND_SOC_TAS571X=m
 CONFIG_SND_SOC_WCD934X=m
+CONFIG_SND_SOC_WM8904=m
 CONFIG_SND_SOC_WSA881X=m
 CONFIG_SND_SIMPLE_CARD=m
 CONFIG_SND_AUDIO_GRAPH_CARD=m
@@ -752,6 +754,7 @@ CONFIG_RTC_DRV_MAX77686=y
 CONFIG_RTC_DRV_RK808=m
 CONFIG_RTC_DRV_PCF85363=m
 CONFIG_RTC_DRV_RX8581=m
+CONFIG_RTC_DRV_RV8803=m
 CONFIG_RTC_DRV_S5M=y
 CONFIG_RTC_DRV_DS3232=y
 CONFIG_RTC_DRV_PCF2127=m
@@ -796,6 +799,7 @@ CONFIG_CROS_EC_SPI=y
 CONFIG_COMMON_CLK_RK808=y
 CONFIG_COMMON_CLK_SCPI=y
 CONFIG_COMMON_CLK_CS2000_CP=y
+CONFIG_COMMON_CLK_FSL_SAI=y
 CONFIG_COMMON_CLK_S2MPS11=y
 CONFIG_COMMON_CLK_PWM=y
 CONFIG_COMMON_CLK_VC5=y