arm64/sve: Rename find_supported_vector_length()

mainline inclusion
from mainline-v5.16-rc1
commit 059613f5
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8E73O
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=059613f546b67423a5b49cb6e6fa8b72fbaa4e0b



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The function has SVE specific checks in it and it will be more trouble
to add conditional code for SME than it is to simply rename it to be SVE
specific.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20211019172247.3045838-6-broonie@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>