powerpc/signal: Update comment for clarity
The comment being referred to was deleted in commit af1bbc3d ("powerpc: Remove UP only lazy floating point and vector optimisations"). Add a bit more detail so it's clear why we need to clear the FP/VEC/VSX bits here. Signed-off-by:Rashmica Gupta <rashmica@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220617043135.426897-1-rashmica@linux.ibm.com
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