Merge 4.19.248 into android-4.19-stable

Changes in 4.19.248
	x86/cpu: Add Elkhart Lake to Intel family
	cpu/speculation: Add prototype for cpu_show_srbds()
	x86/cpu: Add Jasper Lake to Intel family
	x86/cpu: Add Lakefield, Alder Lake and Rocket Lake models to the to Intel CPU family
	x86/cpu: Add another Alder Lake CPU to the Intel family
	Documentation: Add documentation for Processor MMIO Stale Data
	x86/speculation/mmio: Enumerate Processor MMIO Stale Data bug
	x86/speculation: Add a common function for MD_CLEAR mitigation update
	x86/speculation/mmio: Add mitigation for Processor MMIO Stale Data
	x86/bugs: Group MDS, TAA & Processor MMIO Stale Data mitigations
	x86/speculation/mmio: Enable CPU Fill buffer clearing on idle
	x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data
	x86/speculation/srbds: Update SRBDS mitigation selection
	x86/speculation/mmio: Reuse SRBDS mitigation for SBDS
	KVM: x86/speculation: Disable Fill buffer clear within guests
	x86/speculation/mmio: Print SMT warning
	Linux 4.19.248

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I712eb890535cf1af9de1bb7ef9493a719d7d00e5