Expose CLREX via OS_PlatformFeatures
To account for ARM changing their minds about how to clear the exclusive lock on different architectures, provide a function pointer with a known good implementation. This is similar to the run of NOPs returned by OS_PlatformFeatures 0 for those that need it. If in the future any errata or similar are needed, then there's only 1 place to change it, plus clients don't need their own CPU type detection logic. Version 5.77. Tagged as 'Kernel-5_77'
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