powerpc/64: Replace -mcpu=3De500mc64 by -mcpu=3De5500

[Christophe Leroy]

E500MC64 is a processor pre-dating E5500 that has never been
commercialised. Use -mcpu=3De5500 for E5500 core.

More details at https://gcc.gnu.org/PR108149

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Acked-by: Pali Roh=C3=A1r <pali@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/fa71ed20d22c156225436374f0ab847daac893bc.16=
71475543.git.christophe.leroy@xxxxxxxxxx


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