Hello Kishor,
I tried to replicate this issue but I was able to bake u-boot-edm. My environment settings were:
DISPLAY=hdmi720p MACHINE=edm-fairy-imx6 source edm-setup-release.sh -b build-x11 -e x11
Have you tried to bake again after performing a clean all and then trying again?
$ bitbake -c cleanall u-boot-edm
This BSP is maintained by Technexion so I would also recommend reaching them in case the problem persists.
Regards,