A semi-regular kernel update for Leap 15.0.
At this time, mostly for addressing the xen regression (bsc#1113586),
but including tos of other fixes.

- spi/bcm63xx-hsspi: keep pll clk enabled (bsc#1051510).
- spi: sh-msiof: fix deferred probing (bsc#1051510).
- spi: bcm-qspi: switch back to reading flash using smaller chunks
(bsc#1051510).
- commit f773242

- blacklist.conf: Add a few wifi driver entries that can't be applied
- commit 662fc68

- x86/boot/KASLR: Work around firmware bugs by excluding
EFI_BOOT_SERVICES_* and EFI_LOADER_* from KASLR's choice
(bnc#1112878).
- commit d45cd78

- libnvdimm, label: Fix sparse warning (bsc#1111921, bsc#1113408,
FATE#326765, bsc#1113972).
- nvdimm: Use namespace index data to reduce number of label reads
needed (bsc#1111921, bsc#1113408, FATE#326765, bsc#1113972).
- nvdimm: Split label init out from the logic for getting config
data (bsc#1111921, bsc#1113408, FATE#326765, bsc#1113972).
- nvdimm: Remove empty if statement (bsc#1111921, bsc#1113408,
FATE#326765, bsc#1113972).
- nvdimm: Clarify comment in sizeof_namespace_index (bsc#1111921,
bsc#1113408, FATE#326765, bsc#1113972).
- nvdimm: Sanity check labeloff (bsc#1111921, bsc#1113408,
FATE#326765, bsc#1113972).
- libnvdimm, dimm: Maximize label transfer size (bsc#1111921,
bsc#1113408, FATE#326765, bsc#1113972).
- libnvdimm, label: change nvdimm_num_label_slots per UEFI 2.7
(bsc#1111921, bsc#1113408, FATE#326765, bsc#1113972).