kernel: add missing symbols

These cause mediatek arm to fail full builds

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/generic/config-4.14

@@ -4494,6 +4494,7 @@ CONFIG_SND_PROC_FS=y
 # CONFIG_SND_SOC_MEDIATEK is not set
 # CONFIG_SND_SOC_MPC5200_AC97 is not set
 # CONFIG_SND_SOC_MPC5200_I2S is not set
+# CONFIG_SND_SOC_MSM8916_WCD_ANALOG is not set
 # CONFIG_SND_SOC_MSM8916_WCD_DIGITAL is not set
 # CONFIG_SND_SOC_MT2701 is not set
 # CONFIG_SND_SOC_MT8173 is not set

target/linux/mediatek/config-4.14

+# CONFIG_AHCI_MTK is not set
 # CONFIG_AIO is not set
 CONFIG_ALIGNMENT_TRAP=y
 CONFIG_ARCH_CLOCKSOURCE_DATA=y