viafb: Depends on X86

VIA UniChrome and Chrome9 GPUs only exist as Integrated Graphics
Processors in x86 chipsets.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 3d94a14..162a0b7 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1505,7 +1505,7 @@
 
 config FB_VIA
        tristate "VIA UniChrome (Pro) and Chrome9 display support"
-       depends on FB && PCI
+       depends on FB && PCI && X86
        select FB_CFB_FILLRECT
        select FB_CFB_COPYAREA
        select FB_CFB_IMAGEBLIT