ARM: multi_v7_defconfig: Enable audio support for stm32mp157

This commits enable (as module):
- STM32 SAI and I2S configs used on stm32mp157.
- Cirrus CS42L51 audio codec for stm32mp157a-dk1 board.
- Audio graph card support for stm32mp157a-dk1 board.

Link: https://lore.kernel.org/r/20191025125632.11057-1-alexandre.torgue@st.comSigned-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -732,6 +732,8 @@ CONFIG_SND_SOC_ARNDALE=m
 CONFIG_SND_SOC_SH4_FSI=m
 CONFIG_SND_SOC_RCAR=m
 CONFIG_SND_SOC_STI=m
+CONFIG_SND_SOC_STM32_SAI=m
+CONFIG_SND_SOC_STM32_I2S=m
 CONFIG_SND_SUN4I_CODEC=m
 CONFIG_SND_SOC_TEGRA=m
 CONFIG_SND_SOC_TEGRA20_I2S=m
@@ -745,10 +747,12 @@ CONFIG_SND_SOC_TEGRA_ALC5632=m
 CONFIG_SND_SOC_TEGRA_MAX98090=m
 CONFIG_SND_SOC_AK4642=m
 CONFIG_SND_SOC_CPCAP=m
+CONFIG_SND_SOC_CS42L51_I2C=m
 CONFIG_SND_SOC_SGTL5000=m
 CONFIG_SND_SOC_SPDIF=m
 CONFIG_SND_SOC_STI_SAS=m
 CONFIG_SND_SOC_WM8978=m
+CONFIG_SND_AUDIO_GRAPH_CARD=m
 CONFIG_USB=y
 CONFIG_USB_OTG=y
 CONFIG_USB_XHCI_HCD=y