microblaze: Change version tune format.

Modify versions from vXYY to vX.YY to provide distinction between major and minor sections.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
microblaze: Add v9.0 tune.

Add support for microblaze v9.0.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
microblaze: Set FPU_TARGET and add sanity checking

Set bitbake 'known' FPU_TARGET to reflect soft-fpu or hard-fpu
Sanity check: add pattern-compare if reorder only exists in v8.30.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>