Security update for xen

This update for xen fixes the following issues:

- CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).

- Upstream bug fixes (bsc#1027519)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Fixed bugs
bnc#1027519
Xen: Missing upstream bug fixes
bnc#1189632
VUL-0: CVE-2021-28701: xen: Another race in XENMAPSPACE_grant_table handling (XSA-384)
Selected Binaries
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