microblaze: Remove platform folder

There is no reason to use platform folder structure now.
Everything is OF driven.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --cc arch/microblaze/Kconfig
Simple merge

diff --cc arch/microblaze/Kconfig.platform
Simple merge

diff --cc arch/microblaze/Makefile
Simple merge

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

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

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