recipes: Drop remaining PR values from recipes
* as oe-core did in:
https://git.openembedded.org/openembedded-core/commit/?id=d4c346e8ab
* when people are have to maintain own PRs for recipes in oe-core, they
might add them for meta-oe recipes at the same time when upgrading
to next LTS
Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>