imx8mq: cm: drop redundant gd clearing in board_init_f

The global data (gd) area is already zeroed in
board_init_f_init_reserve() before board_init_f() is called.
Remove the duplicate gd clearing from board_init_f().

Signed-off-by: Peng Fan <peng.fan@nxp.com>

board/ronetix/imx8mq-cm/spl.c

@@ -18,8 +18,6 @@
 #include <linux/delay.h>
 #include <spl.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 static void spl_dram_init(void)
 {
 	/* ddr init */
@@ -135,9 +133,6 @@ void board_init_f(ulong dummy)
 {
 	int ret;
 
-	/* Clear global data */
-	memset((void *)gd, 0, sizeof(gd_t));
-
 	arch_cpu_init();
 
 	init_uart_clk(0);