kernel: add missing config symbol (partial forward port of d2f4479870)

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/generic/config-4.4

@@ -3726,6 +3726,7 @@ CONFIG_SND_DRIVERS=y
 # CONFIG_SND_GUSEXTREME is not set
 # CONFIG_SND_GUSMAX is not set
 # CONFIG_SND_HDA_INTEL is not set
+CONFIG_SND_HDA_POWER_SAVE_DEFAULT=0
 CONFIG_SND_HDA_PREALLOC_SIZE=64
 # CONFIG_SND_HDSP is not set
 # CONFIG_SND_HDSPM is not set