[POWERPC] Removed config options that we don't support in embedded6xx

When we started arch/powerpc we duplicated a number of config options from
arch/ppc for various platforms that are supported.  Now that we actually
support a few platforms, remove all the ones that haven't been moved over.
Additionally, this cleanup moved the 82xx/PQ2 options over into
arch/powerpc/platforms/82xx/Kconfig where they belong.  It also killed
GEN550 which doesn't exist in arch/powerpc.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index d39d133..50f48f0 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -132,8 +132,7 @@
 
 config SERIAL_TEXT_DEBUG
 	bool "Support for early boot texts over serial port"
-	depends on 4xx || LOPEC || MV64X60 || PPLUS || PRPMC800 || \
-		PPC_GEN550 || PPC_MPC52xx
+	depends on 4xx
 
 config PPC_EARLY_DEBUG
 	bool "Early debugging (dangerous)"