4.2-stable patches

4.2-stable patches

added patches:
	leds-led-class-add-missing-put_device.patch
	leds-lp55xx-correct-kconfig-dependency-for-f-w-user-helper.patch
	memcg-make-mem_cgroup_read_stat-unsigned.patch
	revert-cgroup-simplify-threadgroup-locking.patch
	revert-sched-cgroup-replace-signal_struct-group_rwsem-with-a-global-percpu_rwsem.patch
	s390-boot-decompression-disable-floating-point-in-decompressor.patch
	s390-compat-correct-uc_sigmask-of-the-compat-signal-frame.patch
	sched-core-fix-task_dead-race-in-finish_task_switch.patch
	use-warn_on_once-for-missing-x86_feature_nrips.patch
	x86-efi-fix-boot-crash-by-mapping-efi-memmap-entries-bottom-up-at-runtime-instead-of-top-down.patch
	x86-kexec-fix-kexec-crash-in-syscall-kexec_file_load.patch
	x86-mm-set-nx-on-gap-between-__ex_table-and-rodata.patch
	x86-process-add-proper-bound-checks-in-64bit-get_wchan.patch
	x86-xen-support-kexec-kdump-in-hvm-guests-by-doing-a-soft-reset.patch