mainline inclusion
from mainline-v5.19-rc1
commit 5e64b862
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5ITJT
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5e64b862c4823ab53aac028042abd918c2f27041

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This patch introduces basic cpufeature support for discovering the presence
of the Scalable Matrix Extension.
Signed-off-by: NMark Brown <broonie@kernel.org>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-9-broonie@kernel.orgSigned-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NWang ShaoBo <bobo.shaobowang@huawei.com>