aarch64-cores.def: Change the scheduler to Thunderx2t99.

aarch64-cores.def: Change the scheduler to Thunderx2t99.

2017-02-06  Julian Brown  <julian@codesourcery.com>
	    Naveen H.S  <Naveen.Hurugalawadi@cavium.com>
	    Virendra Pathak  <virendra.pathak@broadcom.com>

	* config/aarch64/aarch64-cores.def: Change the scheduler
	to Thunderx2t99.
	* config/aarch64/aarch64.md: Include thunderx2t99.md.
	* config/aarch64/thunderx2t99.md: New file.

Co-Authored-By: Naveen H.S <Naveen.Hurugalawadi@cavium.com>
Co-Authored-By: Virendra Pathak <virendra.pathak@broadcom.com>
From-SVN: r245203