powerpc: Add 82xx/83xx/86xx to 6xx Multiplatform

There isn't any reason at this point that we can't build 82xx, 83xx & 86xx
support in with the other 6xx based boards.  Twiddle the Kconfigs to allow
this.

This allows us to remove the machine type selection for related to 6xx.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 87454c5..690c1f4 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -1,36 +1,9 @@
 menu "Platform support"
 
-choice
-	prompt "Machine type"
-	depends on PPC64 || 6xx
-	default PPC_MULTIPLATFORM
-
 config PPC_MULTIPLATFORM
-	bool "Generic desktop/server/laptop"
-	help
-	  Select this option if configuring for an IBM pSeries or
-	  RS/6000 machine, an Apple machine, or a PReP, CHRP,
-	  Maple or Cell-based machine.
-
-config PPC_82xx
-	bool "Freescale 82xx"
-	depends on 6xx
-
-config PPC_83xx
-	bool "Freescale 83xx"
-	depends on 6xx
-	select FSL_SOC
-	select MPC83xx
-	select IPIC
-
-config PPC_86xx
-	bool "Freescale 86xx"
-	depends on 6xx
-	select FSL_SOC
-	select ALTIVEC
-	help
-	  The Freescale E600 SoCs have 74xx cores.
-endchoice
+	bool
+	depends on PPC64 || 6xx
+	default y
 
 config CLASSIC32
 	def_bool y