Merge 4.14.250 into android-4.14-stable

Changes in 4.14.250
	net: mdio: introduce a shutdown method to mdio device drivers
	xen-netback: correct success/error reporting for the SKB-with-fraglist case
	sparc64: fix pci_iounmap() when CONFIG_PCI is not set
	ext2: fix sleeping in atomic bugs on error
	scsi: sd: Free scsi_disk device via put_device()
	usb: testusb: Fix for showing the connection speed
	usb: dwc2: check return value after calling platform_get_resource()
	scsi: ses: Retry failed Send/Receive Diagnostic commands
	libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD.
	lib/timerqueue: Rely on rbtree semantics for next timer
	Linux 4.14.250

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ifccf33c21061e83668b25f829fef2f9da9303d60