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>

arch/x86/Kconfig

@@ -66,6 +66,15 @@ config SMM_TSEG
 config SMM_TSEG_SIZE
 	hex
 
+config X86_RESET_VECTOR
+	bool
+	default n
+
+config SYS_X86_START16
+	hex
+	depends on X86_RESET_VECTOR
+	default 0xfffff800
+
 config BOARD_ROMSIZE_KB_512
 	bool
 config BOARD_ROMSIZE_KB_1024

board/google/chromebook_link/Kconfig

@@ -14,6 +14,7 @@ config SYS_CONFIG_NAME
 
 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

board/intel/crownbay/Kconfig

@@ -14,6 +14,7 @@ config SYS_CONFIG_NAME
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
+	select X86_RESET_VECTOR
 	select INTEL_QUEENSBAY
 	select BOARD_ROMSIZE_KB_1024
 

include/configs/chromebook_link.h

@@ -19,11 +19,9 @@
 #define CONFIG_SYS_CAR_SIZE			(128 * 1024)
 #define CONFIG_SYS_MONITOR_LEN			(1 << 20)
 #define CONFIG_DCACHE_RAM_MRC_VAR_SIZE		0x4000
-#define CONFIG_SYS_X86_START16			0xfffff800
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_DISPLAY_CPUINFO
 
-#define CONFIG_X86_RESET_VECTOR
 #define CONFIG_NR_DRAM_BANKS			8
 #define CONFIG_X86_MRC_ADDR			0xfffa0000
 #define CONFIG_CACHE_MRC_SIZE_KB		512

include/configs/crownbay.h

@@ -14,10 +14,8 @@
 #include <configs/x86-common.h>
 
 #define CONFIG_SYS_MONITOR_LEN		(1 << 20)
-#define CONFIG_SYS_X86_START16		0xfffff800
 #define CONFIG_BOARD_EARLY_INIT_F
 
-#define CONFIG_X86_RESET_VECTOR
 #define CONFIG_NR_DRAM_BANKS		1
 
 #define CONFIG_X86_SERIAL