powerpc: Make CPU selection logic generic in Makefile
At the time being, when adding a new CPU for selection, both Kconfig.cputype and Makefile have to be modified. This patch moves into Kconfig.cputype the name of the CPU to me passed to the -mcpu= argument. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Rename the option to TARGET_CPU to echo the gcc documentation] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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