x86: Move CONFIG_X86_RESET_VECTOR and CONFIG_SYS_X86_START16 to Kconfig

Convert CONFIG_X86_RESET_VECTOR and CONFIG_SYS_X86_START16 to Kconfig
options so that we can remove them from board configuration file.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/board/google/chromebook_link/Kconfig b/board/google/chromebook_link/Kconfig
index 7f79fd2..a9a55e8 100644
--- a/board/google/chromebook_link/Kconfig
+++ b/board/google/chromebook_link/Kconfig
@@ -14,6 +14,7 @@
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
+	select X86_RESET_VECTOR
 	select CPU_INTEL_SOCKET_RPGA989
 	select NORTHBRIDGE_INTEL_IVYBRIDGE
 	select SOUTHBRIDGE_INTEL_C216