bootloaders/mediatek public: update optee to version 3.21

Update optee projects to version 3.21.

• optee-os continue to be a baylibre fork with mediatek patches
• optee_client had all the previous pacthes upstreamed and use upstream repository
• optee_test v3.21 needs some fixes already on master. Using SHA1 of master branch

Depends on:

baylibre/mediatek/bsp/optee-os!1 (merged)

baylibre/mediatek/bsp/build-bootloaders!19 (merged)

baylibre/mediatek/rita/hardware/linaro/kmgk!2 (merged)

baylibre/mediatek/rita/device/mediatek/common!19

Signed-off-by: Vitor Sato Eschholz vsatoes@baylibre.com