MIPS: ralink: Cosmetic change to prom_init().

MIPS: ralink: Cosmetic change to prom_init().

commit 9c48568b3692f1a56cbf1935e4eea835e6b185b1 upstream.

Over the years the code has been changed various times leading to
argc/argv being defined in a different function to where we actually
use the variables. Clean this up by moving them to prom_init_cmdline().

Signed-off-by: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14902/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>