ASoC: davinci: Kconfig: Update the edma-pcm section's dependency and help

Instead of depending on individual SoCs make the edma-pcm depend on the eDMA
dmaengine driver (TI_EDMA).
Update the help text and add DRA7xx family since they have eDMA integrated
as well along with sDMA.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/davinci/Kconfig

@@ -5,7 +5,7 @@ config SND_DAVINCI_SOC
 
 config SND_EDMA_SOC
 	tristate "SoC Audio for Texas Instruments chips using eDMA"
-	depends on SOC_AM33XX || SOC_AM43XX || ARCH_DAVINCI
+	depends on TI_EDMA
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	help
 	  Say Y or M here if you want audio support for TI SoC which uses eDMA.
@@ -13,6 +13,7 @@ config SND_EDMA_SOC
 	  - daVinci devices
 	  - AM335x
 	  - AM437x/AM438x
+	  - DRA7xx family
 
 config SND_DAVINCI_SOC_I2S
 	tristate