BitBake variable assignment whitespace fixes

BitBake variable assignment whitespace fixes

Fix a few instances of BitBake variable assignments without whitespace
to prepare for upstream adding QA checks for that.

Bug-AGL: SPEC-5414

Change-Id: I4cf356b6f4a7fb9bf318b3355ae03b2ef68d3b9d
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/30920
ci-image-boot-test: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account