Make OMAP dspgateway driver play nice with others

The OMAP dspgateway driver causes build failures for non-OMAP machines.
So make build of same depend on ARCH_OMAP=y.
Signed-off-by: George G. Davis <gdavis@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/Makefile

@@ -35,7 +35,7 @@ obj-$(CONFIG_PARPORT)		+= parport/
 obj-y				+= base/ block/ misc/ mfd/ net/ media/ cbus/
 obj-$(CONFIG_I2C)		+= i2c/
 obj-y				+= cbus/
-obj-y				+= dsp/dspgateway/
+obj-$(CONFIG_ARCH_OMAP)		+= dsp/dspgateway/
 obj-$(CONFIG_NUBUS)		+= nubus/
 obj-$(CONFIG_ATM)		+= atm/
 obj-y				+= macintosh/