frdm-ls1012a-pa ppa tee-os

[mukunkong]

Recently need to verify trustzone on board(frdm-ls1012a-pa),find ppa in the sdk-2017, I don't know the relationship between tee-os and ppa，and the apposite u-boot to load ppa

[yipingwang]

Please refer to https://community.nxp.com/thread/478179 .