ARM: imx6: Disable DDR DRAM calibration DHCOM i.MX6 PDK

The DDR DRAM calibration doesn't work on T-topology sometimes, so disable it.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

board/dhelectronics/dh_imx6/dh_imx6_spl.c

@@ -387,10 +387,6 @@ void board_init_f(ulong dummy)
 				  &dhcom6sdl_grp_ioregs);
 	mx6_dram_cfg(&dhcom_ddr_info, &dhcom_mmdc_calib, &dhcom_mem_ddr);
 
-	/* Perform DDR DRAM calibration */
-	udelay(100);
-	mmdc_do_dqs_calibration(&dhcom_ddr_info);
-
 	/* Clear the BSS. */
 	memset(__bss_start, 0, __bss_end - __bss_start);