ti-gfx: only available on x86(-64) hosts

ti-gfx is provided as a x86 self extracting executable, so it is only
available on x86(-64) hosts.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit e480e88169160ad2d2972c949336a668e122af98)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ti-gfx/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_TI_GFX
 	bool "ti-gfx"
 	depends on BR2_LINUX_KERNEL && BR2_TOOLCHAIN_USES_GLIBC && BR2_arm
+	depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
 	select BR2_HOSTARCH_NEEDS_IA32_LIBS
 	select BR2_PACKAGE_HAS_LIBEGL
 	select BR2_PACKAGE_HAS_LIBGLES