uefi-build.sh was deleted, need update the script

[liuyunli]

"https://trustedfirmware-a.readthedocs.io/en/latest"
the "PLATFORM PORTS" -> HIKey960 ->How to build ->Build Procedure,
${UEFI_TOOLS_DIR}/uefi-build.sh -b ${BUILD_OPTION} -a ../arm-trusted-firmware -s ../optee_os hikey960 "

the file uefi-build.sh was deleted in the latest uefi-tools git.
Need to update the docs.

[ssg-bot]

Hello @liuyunli!

Thank you for raising an issue for Trusted Firmware-A.

The TF-A project has now migrated to www.trustedfirmware.org. This issue tracker will still remain accessible for some time, but only for historical reasons. From now on you should raise new issues on trustedfirmware.org.

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The Trusted Firmware-A team