powerpc: Remove 40x leftovers

Remove stale references to 40x.

Fixes: e939da89 ("powerpc: Remove 40x from Kconfig and defconfig")
Fixes: 548f5244 ("powerpc/40x: Remove EP405")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/ab30ae302783d8617d407864b92db1b926ab5ab9.1720694914.git.christophe.leroy@csgroup.eu

arch/powerpc/boot/wrapper

@@ -337,7 +337,7 @@ ps3)
     make_space=n
     pie=
     ;;
-ep88xc|ep405|ep8248e)
+ep88xc|ep8248e)
     platformo="$object/fixed-head.o $object/$platform.o"
     binary=y
     ;;

arch/powerpc/platforms/Kconfig.cputype

@@ -250,7 +250,6 @@ config TARGET_CPU
 	default "e6500" if E6500_CPU
 	default "power4" if POWERPC64_CPU && !CPU_LITTLE_ENDIAN
 	default "power8" if POWERPC64_CPU && CPU_LITTLE_ENDIAN
-	default "405" if 405_CPU
 	default "440" if 440_CPU
 	default "464" if 464_CPU
 	default "476" if 476_CPU