x86: Use cache, don't clear the display in video BIOS

There is no need to run with the cache disabled, and there is no point in
clearing the display frame buffer since U-Boot does it later.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/lib/bios.c

@@ -210,8 +210,8 @@ static u8 vbe_set_mode(struct vbe_mode_info *mi)
 	debug("VBE: Setting VESA mode %#04x\n", mi->video_mode);
 	/* request linear framebuffer mode */
 	mi->video_mode |= (1 << 14);
-	/* request clearing of framebuffer */
-	mi->video_mode &= ~(1 << 15);
+	/* don't clear the framebuffer, we do that later */
+	mi->video_mode |= (1 << 15);
 	realmode_interrupt(0x10, VESA_SET_MODE, mi->video_mode,
 			   0x0000, 0x0000, 0x0000, 0x0000);
 
@@ -262,7 +262,6 @@ void bios_run_on_x86(pci_dev_t pcidev, unsigned long addr, int vesa_mode,
 	/* Make sure the code is placed. */
 	setup_realmode_code();
 
-	disable_caches();
 	debug("Calling Option ROM at %lx, pci device %#x...", addr, num_dev);
 
 	/* Option ROM entry point is at OPROM start + 3 */