Merge 4.9.50 into android-4.9

Changes in 4.9.50
	mtd: nand: mxc: Fix mxc_v1 ooblayout
	mtd: nand: qcom: fix read failure without complete bootchain
	mtd: nand: qcom: fix config error for BCH
	nvme-fabrics: generate spec-compliant UUID NQNs
	btrfs: resume qgroup rescan on rw remount
	selftests/x86/fsgsbase: Test selectors 1, 2, and 3
	mm/memory.c: fix mem_cgroup_oom_disable() call missing
	locktorture: Fix potential memory leak with rw lock test
	ALSA: msnd: Optimize / harden DSP and MIDI loops
	Bluetooth: Properly check L2CAP config option output buffer length
	ARM64: dts: marvell: armada-37xx: Fix GIC maintenance interrupt
	ARM: 8692/1: mm: abort uaccess retries upon fatal signal
	NFS: Fix 2 use after free issues in the I/O code
	NFS: Sync the correct byte range during synchronous writes
	xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present
	Linux 4.9.50

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>