powerpc: remove STACK_FRAME_OVERHEAD
This is equal to STACK_FRAME_MIN_SIZE on 32-bit and 64-bit ELFv1, and no longer used in 64-bit ELFv2, so replace STACK_FRAME_OVERHEAD occurrences with STACK_FRAME_MIN_SIZE. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20221127124942.1665522-18-npiggin@gmail.com
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