[ELSA-2021-9051] Unbreakable Enterprise kernel security update

[4.1.12-124.48.3.1]
- xen-blkback: fix error handling in xen_blkbk_map() (Jan Beulich) [Orabug: 32492113] {CVE-2021-26930}
- xen-scsiback: don't 'handle' error by BUG() (Jan Beulich) [Orabug: 32492105] {CVE-2021-26931}
- xen-netback: don't 'handle' error by BUG() (Jan Beulich) [Orabug: 32492105] {CVE-2021-26931}
- xen-blkback: don't 'handle' error by BUG() (Jan Beulich) [Orabug: 32492105] {CVE-2021-26931}
- Xen/gntdev: correct error checking in gntdev_map_grant_pages() (Jan Beulich) [Orabug: 32492098] {CVE-2021-26932}
- Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages() (Jan Beulich) [Orabug: 32492098] {CVE-2021-26932}
- Xen/x86: also check kernel mapping in set_foreign_p2m_mapping() (Jan Beulich) [Orabug: 32492098] {CVE-2021-26932}
- Xen/x86: don't bail early from clear_foreign_p2m_mapping() (Jan Beulich) [Orabug: 32492098] {CVE-2021-26932}

[4.1.12-124.48.3]
- bnxt_en: Fix ethtool -x crash when device is down. (Michael Chan) [Orabug: 32466092]