[FMV][AArch64] Remove features predres and ls64. (#124266)

These cannot be detected by reading the ID_AA64ISAR1_EL1 register since
their corresponding bitfields are hidden. Additionally the instruc

[FMV][AArch64] Remove features predres and ls64. (#124266)

These cannot be detected by reading the ID_AA64ISAR1_EL1 register since
their corresponding bitfields are hidden. Additionally the instructions
that these features enable are unusable from EL0.

ACLE: https://github.com/ARM-software/acle/pull/382

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[FMV][AArch64] Changes in fmv-features metadata. (#122192)

* We want the default version to have this attribute too otherwise it
becomes indistinguishable from non-versioned functions.

* We don'

[FMV][AArch64] Changes in fmv-features metadata. (#122192)

* We want the default version to have this attribute too otherwise it
becomes indistinguishable from non-versioned functions.

* We don't need the '+' unlike target-features which can negate. This
will allow using the parsing API of target_version/clones for the
metadata too.

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[FMV][AArch64] Simplify version selection according to ACLE. (#121921)

Currently, the more features a version has, the higher its priority is.
We are changing ACLE https://github.com/ARM-software/a

[FMV][AArch64] Simplify version selection according to ACLE. (#121921)

Currently, the more features a version has, the higher its priority is.
We are changing ACLE https://github.com/ARM-software/acle/pull/370 as
follows:

"Among any two versions, the higher priority version is determined by
identifying the highest priority feature that is specified in exactly
one of the versions, and selecting that version."

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