Update CHANGELOG.md for 3.3.0
Update CHANGELOG.md for 3.3.0

Signed-off-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>
Tested-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org> (QEMU, GP)
Tested-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org> (QEMUv8)
Tested-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org> (FVP)
Tested-by: Sumit Garg <0904b466d9452daa97eb086f40b9aaa7e498e972@linaro.org> (Developerbox)
Tested-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org> (HiKey960, GP)
Tested-by: Victor Chong <4aabb03bd6dd29c44a49684d87b08ac07e10b492@linaro.org> (HiKey620 AOSP)
Tested-by: Igor Opaniuk <ca782e5848fbe7ab0a250faa8ae33b643dd89a09@linaro.org> (RPi3)
Tested-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org> (Juno AArch64)
Tested-by: Etienne Carriere <f21bc5b8f3ea1962eb45af359f1abea6578cab94@linaro.org> (b2120/b2260, GP)
Tested-by: Etienne Carriere <f21bc5b8f3ea1962eb45af359f1abea6578cab94@linaro.org> (stm32mp1, GP)
Tested-by: Akshay Bhat <124e9ed437bdfdc15bb6080f285761d3d4b394cb@timesys.com> (Atmel SAM)
Tested-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org> (Hikey)
Tested-by: Igor Opaniuk <ca782e5848fbe7ab0a250faa8ae33b643dd89a09@linaro.org> (Poplar)
Tested-by: Joseph Chen <80c6ec8323b5b397c988e3ebe83c48154c3f18db@rock-chips.com> (RK322X)
Tested-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org> (Juno)

pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os