Drop default from "DM365 codec select" choice

SND_DM365_EXTERNAL_CODEC does not exist, so it's a useless default.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

sound/soc/davinci/Kconfig

@@ -29,7 +29,6 @@ choice
 	prompt "DM365 codec select"
 	depends on SND_DAVINCI_SOC_EVM
 	depends on MACH_DAVINCI_DM365_EVM
-	default SND_DM365_EXTERNAL_CODEC
 
 config SND_DM365_AIC3X_CODEC
 	bool "Audio Codec - AIC3101"