lttng-modules: upgrade 2.12.6 -> 2.12.7

Changelog:

* fix: mm: move kvmalloc-related functions to slab.h (v5.16)
* fix: block: don't call blk_status_to_errno in blk_update_request (v5.16)
* fix: KVM: MMU: change tracepoints arguments to kvm_page_fault (v5.16)
* fix: KVM: x86: Get exit_reason as part of kvm_x86_ops.get_exit_info (v5.16)
* fix: isystem: delete global -isystem compile option (v5.16)
* fix: block: move block-related definitions out of fs.h (v5.16)
* fix: implicit-int error in EXPORT_SYMBOL_GPL
* fix: Revert "Makefile: Enable -Wimplicit-fallthrough for Clang" (v5.15)
* fix: cpu/hotplug: Remove deprecated CPU-hotplug functions. (v5.15)
* fix: sched: Change task_struct::state (v5.14)
* fix: btrfs: pass btrfs_inode to btrfs_writepage_endio_finish_ordered() (v5.14)
* fix: adjust ranges for RHEL 8.4

Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>