Build - mka: change how make is called

in some environments make -j N xxx results in compiling target 'N'
instead of 'xxx'
make -jN xxx will always make 'xxx' with N number of threads

Change-Id: I59777dd3bf966a97bc686d7cd39a595c5551d4f8
Signed-off-by: STELIX <ssspinni@gmail.com>