lttng-modules: update 2.11.8 -> 2.11.9

lttng-modules: update 2.11.8 -> 2.11.9

2021-05-14 (National Dance Like a Chicken Day) LTTng modules 2.11.9
	* fix: adjust ranges for RHEL 8.2 and 8.3
	* Sync `show_inode_state()` macro with upstream stable kernels
	* fix: block: remove disk_part_iter (v5.12)
	* Fix: Backport of "Fix: increment buffer offset when failing to copy from user-space"
	* Fix: increment buffer offset when failing to copy from user-space
	* Sync `show_inode_state()` macro with Ubuntu 4.15 kernel
	* fix: mm, tracing: kfree event name mismatching with provider kmem (v5.12)
	* Set 'stable-2.11' branch in git review config
	* fix backport: block: add a disk_uevent helper (v5.12)
	* fix: Adjust ranges for Ubuntu 5.4.0-67 kernel
	* fix: block: add a disk_uevent helper (v5.12)
	* Fix: properly compare type enumeration
	* compiler warning cleanup: is_signed_type: compare -1 to 1
	* Fix: bytecode linker: validate event and field array/sequence encoding
	* Fix: kretprobe: null ptr deref on session destroy
	* fix: mm, tracing: record slab name for kmem_cache_free() (v5.12)
	* Fix: filter interpreter early-exits on uninitialized value
	* Fix: memory leaks on event destroy

Signed-off-by: Steve Sakoman <steve@sakoman.com>