MIPS: bmips: remove unnecessary call to register "simple-bus"

MIPS: bmips: remove unnecessary call to register "simple-bus"

The DT core will register "simple-bus" by default, so it is not necessary
for arch specific code to do so unless there are custom match entries,
auxdata or parent device. Neither of those apply here, so remove the call.

Cc: Kevin Cernekee <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Paul Burton <[email protected]>
Cc: James Hogan <[email protected]>
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/19590/
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]