ASoC: omap: Remove OMAP_MUX dependency from Nokia N810 audio support

Commit e9f5f1e45608 ("ARM: OMAP2+: Remove legacy mux code") removed
CONFIG_OMAP_MUX making impossible to build Nokia N810 audio support. Remove
this dependency so we can do at least build tests.

Fixes: e9f5f1e45608 ("ARM: OMAP2+: Remove legacy mux code")
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/omap/Kconfig

@@ -30,7 +30,6 @@ config SND_OMAP_SOC_HDMI_AUDIO
 config SND_OMAP_SOC_N810
 	tristate "SoC Audio support for Nokia N810"
 	depends on SND_OMAP_SOC && MACH_NOKIA_N810 && I2C
-	depends on OMAP_MUX
 	select SND_OMAP_SOC_MCBSP
 	select SND_SOC_TLV320AIC3X
 	help