drm: xlnx: Fix typo in parameter description

Fix typo in parameter description.

Fixes: d76271d2 ("drm: xlnx: DRM/KMS driver for Xilinx ZynqMP DisplayPort Subsystem")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hyun Kwon <hyun.kwon@xilinx.com>
Signed-off-by: Hyun Kwon <hyun.kwon@xilinx.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200725063429.172139-1-weiyongjun1@huawei.com

drivers/gpu/drm/xlnx/zynqmp_dp.c

@@ -44,7 +44,7 @@ MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
  */
 static uint zynqmp_dp_power_on_delay_ms = 4;
 module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
-MODULE_PARM_DESC(aux_timeout_ms, "DP power on delay in msec (default: 4)");
+MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
 
 /* Link configuration registers */
 #define ZYNQMP_DP_LINK_BW_SET				0x0