add missing symbol spotted by buildbot.

SVN-Revision: 23891

target/linux/ep93xx/config-2.6.36

@@ -187,6 +187,7 @@ CONFIG_PERF_USE_VMALLOC=y
 CONFIG_SERIAL_AMBA_PL010=y
 CONFIG_SERIAL_AMBA_PL010_CONSOLE=y
 # CONFIG_SERIAL_AMBA_PL011 is not set
+# CONFIG_SND_EP93XX_SOC is not set
 # CONFIG_SPARSE_IRQ is not set
 CONFIG_SPI=y
 CONFIG_SPI_BITBANG=y