Remove meta-python dependencies

Remove remaining meta-python dependencies from layer and recipe
configuration.  The agl-ivi-demo-platform-html5 image has been
confirmed to build with these changes, and they are a prerequisite
for removing meta-python from the repo manifest.

Bug-AGL: SPEC-5099

Change-Id: I1d8ff343eef2d883bbc5b5baf0f7b69b161faf94
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29745
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account