[POWERPC] Clean up zImage handling of the command line

This cleans up how the zImage code manipulates the kernel
command line.  Notable improvements from the old handling:
	- Command line manipulation is consolidated into a new
prep_cmdline() function, rather than being scattered across start()
and some helper functions
	- Less stack space use: we use just a single global command
line buffer, which can be initialized by an external tool as before,
we no longer need another command line sized buffer on the stack.
	- Easier to support platforms whose firmware passes a
commandline, but not a device tree.  Platform code can now point new
loader_info fields to the firmware's command line, rather than having
to do early manipulation of the /chosen bootargs property which may
then be rewritten again by the core.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/ops.h

@@ -70,6 +70,8 @@ struct serial_console_data {
 struct loader_info {
 	void *promptr;
 	unsigned long initrd_addr, initrd_size;
+	char *cmdline;
+	int cmdline_len;
 };
 extern struct loader_info loader_info;