ALSA: Merge es1688 and es968 drivers

The ESS ES968 chip is nothing more then a PnP companion
for a non-PnP audio chip. It was paired with non-PnP ESS' chips:
ES688 and ES1688. The ESS' audio chips are handled by the es1688
driver in native mode. The PnP cards are handled by the ES968
driver in SB compatible mode.

Move the ES968 chip handling to the es1688 driver so the driver
can handle both PnP and non-PnP cards. The es968 is removed.

Also, a new PnP id is added for the card I acquired (the change
was tested on this card).

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/isa/Kconfig b/sound/isa/Kconfig
index 755a0a5..c6990c6 100644
--- a/sound/isa/Kconfig
+++ b/sound/isa/Kconfig
@@ -128,26 +128,14 @@
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-cs4236.
 
-config SND_ES968
-	tristate "Generic ESS ES968 driver"
-	depends on PNP
-	select ISAPNP
-	select SND_MPU401_UART
-	select SND_SB8_DSP
-	help
-	  Say Y here to include support for ESS AudioDrive ES968 chips.
-
-	  To compile this driver as a module, choose M here: the module
-	  will be called snd-es968.
-
 config SND_ES1688
-	tristate "Generic ESS ES688/ES1688 driver"
+	tristate "Generic ESS ES688/ES1688 and ES968 PnP driver"
 	select SND_OPL3_LIB
 	select SND_MPU401_UART
 	select SND_PCM
 	help
 	  Say Y here to include support for ESS AudioDrive ES688 or
-	  ES1688 chips.
+	  ES1688 chips. Also, this module support cards with ES968 PnP chip.
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-es1688.