x86: Remove DECLARE_GLOBAL_DATA_PTR in board files

gd is not referenced in those board files so DECLARE_GLOBAL_DATA_PTR
should be removed.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

board/intel/crownbay/crownbay.c

@@ -12,8 +12,6 @@
 
 #define SERIAL_DEV PNP_DEV(0x2e, 4)
 
-DECLARE_GLOBAL_DATA_PTR;
-
 int board_early_init_f(void)
 {
 	lpc47m_enable_serial(SERIAL_DEV, UART0_BASE, UART0_IRQ);

board/intel/galileo/galileo.c

@@ -6,8 +6,6 @@
 
 #include <common.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 int board_early_init_f(void)
 {
 	return 0;

board/intel/minnowmax/minnowmax.c

@@ -12,8 +12,6 @@
 
 #define SERIAL_DEV PNP_DEV(0x2e, 4)
 
-DECLARE_GLOBAL_DATA_PTR;
-
 int board_early_init_f(void)
 {
 	lpc47m_enable_serial(SERIAL_DEV, UART0_BASE, UART0_IRQ);