microblaze: Use generic init_task

Same code. Use the generic version.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Michal Simek <monstr@monstr.eu>
Link: http://lkml.kernel.org/r/20120503085034.881532838@linutronix.de

diff --cc arch/microblaze/Kconfig
Simple merge

diff --cc arch/microblaze/kernel/Makefile
Simple merge

diff --cc arch/microblaze/kernel/init_task.c
Simple merge