Allow more than one dex2oat extra option

All extra options are provided as one argument to dex2oat.
The patch splits all options to individual ones.

Change-Id: Ied65bb9cf38b114611e88a8d5d86305021700d0b
Signed-off-by: Serguei Katkov <serguei.i.katkov@intel.com>
Signed-off-by: Yevgeny Rouban <yevgeny.y.rouban@intel.com>