Please have a look into the file README-IMXBSP in the top directory of the Yocto repository. This worked for me.
Add Chromium to your Wayland or X11-based image by adding the following lines to local.conf:
# Add Chromium
IMAGE_INSTALL_append = \
"${@bb.utils.contains('DISTRO_FEATURES', 'wayland', ' chromium-ozone-wayland libexif', \
bb.utils.contains('DISTRO_FEATURES', 'x11', ' chromium-x11 libexif', \
'', d), d)}"
LICENSE_FLAGS_WHITELIST = \
"${@bb.utils.contains('DISTRO_FEATURES', 'wayland', 'commercial', \
bb.utils.contains('DISTRO_FEATURES', 'x11', 'commercial', \
'', d), d)}"