powerpc/kconfig: Move CONFIG_PPC32 into Kconfig.cputype

Move CONFIG_PPC32 at the same place as CONFIG_PPC64 for consistency.
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6f28085c2a1aa987093d50db17586633bbf8e206.1579024426.git.christophe.leroy@c-s.fr

arch/powerpc/Kconfig

 # SPDX-License-Identifier: GPL-2.0
 source "arch/powerpc/platforms/Kconfig.cputype"
 
-config PPC32
-	bool
-	default y if !PPC64
-
 config 32BIT
 	bool
 	default y if PPC32

arch/powerpc/platforms/Kconfig.cputype

 # SPDX-License-Identifier: GPL-2.0
+config PPC32
+	bool
+	default y if !PPC64
+
 config PPC64
 	bool "64-bit kernel"
 	select ZLIB_DEFLATE