realmode/x86: Export vbe_mode_info_valid also in text mode.

Fixes linking error. Specifies that we're in text mode.

Change-Id: I7ad258961039c19e1491e2b3832b003671d8a5c7
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/11848
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
diff --git a/src/device/oprom/realmode/x86.c b/src/device/oprom/realmode/x86.c
index 796c9fe..b8f54f3 100644
--- a/src/device/oprom/realmode/x86.c
+++ b/src/device/oprom/realmode/x86.c
@@ -316,6 +316,18 @@
 	framebuffer->reserved_mask_pos = mode_info.vesa.reserved_mask_pos;
 	framebuffer->reserved_mask_size = mode_info.vesa.reserved_mask_size;
 }
+
+#else
+
+int vbe_mode_info_valid(void)
+{
+	return 0;
+}
+
+void fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
+{
+}
+
 #endif
 
 void run_bios(struct device *dev, unsigned long addr)