LSK backported features

1, The kaslr and kaslr-pax_usercopy branches base on LSK directly.
	v4.4/topic/mm-kaslr
	v4.4/topic/mm-kaslr-pax_usercopy

2, Coresight and openCSD are used for Juno board 'perf' tool implement.
	origin/v4.4/topic/coresight
	origin/v4.4/topic/perf-opencsd-4.4-github

3, OPTEE base on LSK mainline, but isn't included of mainline.

Feature introducation:
https://wiki.linaro.org/lsk/features