Regular update of Leap 42.3 kernel.

- efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps
(bsc#1037312).
- commit 7cee982

- x86/platform/uv/BAU: Implement uv4_wait_completion with
read_status (bsc#1035024).
- x86/platform/uv/BAU: Add wait_completion to bau_operations
(bsc#1035024).
- x86/platform/uv/BAU: Add status mmr location fields to
bau_control (bsc#1035024).
- x86/platform/uv/BAU: Add payload descriptor qualifier
(bsc#1035024).
- x86/platform/uv/BAU: Add uv_bau_version enumerated constants
(bsc#1035024).
- x86/platform/uv/BAU: Cleanup bau_operations declaration and
instances (bsc#1035024).
- x86/platform/uv/BAU: Fix HUB errors by remove initial write
to sw-ack register (bsc#1035024).
- x86/platform/uv/BAU: Add UV4-specific functions (bsc#1035024).
- x86/platform/uv/BAU: Fix payload queue setup on UV4 hardware
(bsc#1035024).
- x86/platform/uv/BAU: Disable software timeout on UV4 hardware
(bsc#1035024).
- x86/platform/uv/BAU: Populate ->uvhub_version with UV4 version
information (bsc#1035024).
- x86/platform/uv/BAU: Use generic function pointers
(bsc#1035024).
- x86/platform/uv/BAU: Add generic function pointers
(bsc#1035024).
- x86/platform/uv/BAU: Convert uv_physnodeaddr() use to