video: bochs: Remove the x86 dependency

Now that the driver is legacy free, remove the x86 dependency so
that it can be used on non-x86 architectures.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>  # qemu-x86_64
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index b41dc60..3cdaa5f 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -280,7 +280,6 @@
 
 config VIDEO_BOCHS
 	bool "Enable Bochs video emulation for QEMU"
-	depends on X86
 	help
 	  Enable this to use the Bochs video support provided in the QEMU
 	  emulator. This appears as a PCI device which U-Boot can set up to