microblaze: Add mm/Kconfig to advance menu
mm/Kconfig is getting too big to be in root menu.
Move it to submenu.
Signed-off-by: 
Michal Simek <michal.simek@xilinx.com>
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mm/Kconfig is getting too big to be in root menu.
Move it to submenu.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>