xen: drop PR variable from include file
xen: drop PR variable from include file

The PR server has taken care of revision bumps for quite some time, so
we can safely drop PR from the xen .inc file.

Signed-off-by: Doug Goldstein <8172f793ca553050868d487fd13b508d19cae503@cardoe.com>
Signed-off-by: Bruce Ashfield <284cc737d174a260eec2a2a6324a304f84b1ae0f@windriver.com>

cardoe/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,cjp256/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cjp256/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization