powerpc updates for 4.2

 - Disable the 32-bit vdso when building LE, so we can build with a 64-bit only
   toolchain.
 - EEH fixes from Gavin & Richard.
 - Enable the sys_kcmp syscall from Laurent.
 - Sysfs control for fastsleep workaround from Shreyas.
 - Expose OPAL events as an irq chip by Alistair.
 - MSI ops moved to pci_controller_ops by Daniel.
 - Fix for kernel to userspace backtraces for perf from Anton.
 - Merge pseries and pseries_le defconfigs from Cyril.
 - CXL in-kernel API from Mikey.
 - OPAL prd driver from Jeremy.
 - Fix for DSCR handling & tests from Anshuman.
 - Powernv flash mtd driver from Cyril.
 - Dynamic DMA Window support on powernv from Alexey.
 - LLVM clang fixes & workarounds from Anton.
 - Reworked version of the patch to abort syscalls when transactional.
 - Fix the swap encoding to support 4TB, from Aneesh.
 - Various fixes as usual.
 - Freescale updates from Scott: Highlights include more 8xx optimizations, an
   e6500 hugetlb optimization, QMan device tree nodes, t1024/t1023 support, and
   various fixes and cleanup.
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