x86: Rename CONFIG_NO_X86_RESET_VECTOR to CONFIG_X86_RESET_VECTOR

Invert the polarity of this option to simplify the Makefile logic.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Gabe Black <gabeblack@chromium.org>
diff --git a/README b/README
index 2352e38..6106e0d 100644
--- a/README
+++ b/README
@@ -3816,9 +3816,9 @@
 		be used if available. These functions may be faster under some
 		conditions but may increase the binary size.
 
-- CONFIG_X86_NO_RESET_VECTOR
-		If defined, the x86 reset vector code is excluded. You will need
-		to do this when U-Boot is running from Coreboot.
+- CONFIG_X86_RESET_VECTOR
+		If defined, the x86 reset vector code is included. This is not
+		needed when U-Boot is running from Coreboot.
 
 - CONFIG_X86_NO_REAL_MODE
 		If defined, x86 real mode code is omitted. This assumes a