Update CHANGELOG for 4.9.0

[jenswi-linaro]

Update CHANGELOG for 4.9.0 and collect Tested-by tags.

The 4.9.0-rc1 tag will be created today, Monday, December 29, and the 4.9.0 release is expected on January 16.

[b49020]

Tested-by: Sumit Garg <sumit.garg@oss.qualcomm.com> (qcom-kodiak)

# xtest -l 15
...
+-----------------------------------------------------
333921 subtests of which 0 failed
111 test cases of which 0 failed
0 test cases were skipped
TEE test application done!

[amey-raghatate]

Tested-by: Amey Raghatate <ameyavinash.raghatate@amd.com> (AMD Versal Gen 2)

[sahilnxp]

For commit 2949576

Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx6dlsabresd)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx6sxsabresd)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx6ulevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx6ullevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx7dsabresd)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx7ulpevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8dxlevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8mmevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8mnevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8mqevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8mpevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8qmmek)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8qxpmek)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx8ulpevk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx93evk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx91evk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx95evk)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (imx-mx943evk)

Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (LX2160A-RDB)
Tested-by: Sahil Malhotra <sahil.malhotra@nxp.com> (LS1046A-RDB)

[jockebech]

With OP-TEE/build#855

# xtest -l 15
...
333963 subtests of which 0 failed
112 test cases of which 0 failed
0 test cases were skipped
TEE test application done!

Tested-by: Joakim Bech <joakim.bech@gmail.com> (Rpi3)