MIPS: No longer hardwire CONFIG_EMBEDDED to y

There's no reason for MIPS to select EMBEDDED.  In fact, EMBEDDED makes
MIPS more awkward to deal with because it makes it different to the
majority of architectures for no good reason.

[Ralf: Historically disabling EMBEDDED had hid essential options for many
 MIPS platforms such as serial console and forced crap like VGA support
 or power managment enabled for platforms where those don't make any sense.

 The name of the option is also _very_ missleading so many users don't
 select it even where is was required for a functioning kernel.]

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/663/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>