x86: cbfs: Unconditionally include the rom_media.c source file.

CBFS is always turned on, so we might as well always include this file.

Change-Id: I0f5727fc410e1247beffd0db15d1ecd751e1d3f8
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index aa7c789..9f57653 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -19,7 +19,7 @@
 subdirs-$(CONFIG_ARCH_X86_AMD64) += amd64
 
 depthcharge-y += boot.c
-libcbfs-$(CONFIG_CBFS) += rom_media.c
+libcbfs-y += rom_media.c
 depthcharge-y += sign_of_life.c
 depthcharge-y += util.S
 depthcharge-$(CONFIG_KERNEL_ZIMAGE) += zimage.c