Hello Bhavani,
It seems like there’s an issue for that specific functionality in the version of Weston that NXP (and by extension us) ship.
Another customer applied a patch from upstream Weston that solves the issue and was kind enough to report the steps to us, please take a look: Apalis IMX8 HDMI and LVDS display not mirroring/cloning - #13 by HieuNong
Regards,