pinephone: Use OPTEE for KeyMaster and GateKeeper

[rsglobal]

1. Setup OPTEE os:
   https://mquaresma.github.io/pine/a64/2020/04/11/Setting-up-OPTEE-and-Linux-for-the-Pine-A64.html

2. Add Linaro HALs:
   https://github.com/linaro-swg/kmgk

[twilligon]

Why not Trusty?

[rsglobal]

OPTEE officially supports A64 SOC . Will trusty work on it too?

[twilligon]

Good point. Looks like it's not officially supported on A64...

…

On Mon Oct 19, 2020 at 3:25 AM PDT, rsglobal wrote: OPTEE officially supports A64 SOC . Will trusty work on it too? -- You are receiving this because you commented. Reply to this email directly or view it on GitHub: #95 (comment)

[rsglobal]

I am not an expert, Trusty has generic arm64 device, which gives me a hope that it can be possible on any SOC without using SOC hardware acceleration. But at least true random number generator will be missing, which is bad for security stuff.