imx: imx8mq_evk: Drop DECLARE_GLOBAL_DATA_PTR

There is no gd used in the board file, so drop DECLARE_GLOBAL_DATA_PTR.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/board/freescale/imx8mq_evk/imx8mq_evk.c b/board/freescale/imx8mq_evk/imx8mq_evk.c
index 64a2f25..f833996 100644
--- a/board/freescale/imx8mq_evk/imx8mq_evk.c
+++ b/board/freescale/imx8mq_evk/imx8mq_evk.c
@@ -6,12 +6,9 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/imx8mq_pins.h>
 #include <asm/arch/sys_proto.h>
-#include <asm/global_data.h>
 #include <asm/mach-imx/iomux-v3.h>
 #include <env.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 #define UART_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_FSEL1)
 
 #define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_HYS | PAD_CTL_PUE)