MIPS: bcm3384: Rename "bcm3384" target to "bmips"

This platform is configured primarily through device tree, and we can
reuse the same code to support a bunch of other chips.  Change the name
to reflect this.

[ralf@linux-mips.org: Fix conflicts with other patches.]

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: f.fainelli@gmail.com
Cc: jaedon.shin@gmail.com
Cc: abrestic@chromium.org
Cc: tglx@linutronix.de
Cc: jason@lakedaemon.net
Cc: jogo@openwrt.org
Cc: computersforpeace@gmail.com
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8838/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>