modules: make kmod-pcspkr depend on X86

The kernel Kconfig dependency lists X86, and we will fail building this module
on other platforms such as Malta.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 39974

package/kernel/linux/modules/sound.mk

@@ -262,7 +262,7 @@ $(eval $(call KernelPackage,sound-soc-gw_avila))
 
 
 define KernelPackage/pcspkr
-  DEPENDS:=@!TARGET_x86
+  DEPENDS:=@TARGET_x86
   TITLE:=PC speaker support
   KCONFIG:= \
 	CONFIG_INPUT_PCSPKR \