optee branch rebased onto upstream kernel v5.17

[jforissier]

Hi,

FYI - In preparation for the next OP-TEE release, I have rebased linaro-swg/linux branch optee onto Linux kernel v5.17. The only differences between our branch and upstream are:

• DTS updates
• One commit reverted pending a fix in the Xen mediator. Note that Xen 4.16.0 has the fix, but Buildroot is still using 4.14.x.