x86: Switch QEMU over to use the bochs driver

This is more convenient since it does not require a video BIOS. Enable
it for QEMU.

Also drop use of video in SPL for the 64-bit QEMU, since it not needed
now.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/qemu/Kconfig b/arch/x86/cpu/qemu/Kconfig
index f8f2f64..aa329b0 100644
--- a/arch/x86/cpu/qemu/Kconfig
+++ b/arch/x86/cpu/qemu/Kconfig
@@ -12,7 +12,7 @@
 	imply SYS_NS16550
 	imply USB
 	imply USB_EHCI_HCD
-	imply VIDEO_VESA
+	imply VIDEO_BOCHS
 
 if QEMU