jammy-amd64-tf-a-build: Remove ArmClang 6.9

It's not referenced by any CI related repos (tf-a-ci-scripts or otherwise),
and clearly just a remnant from previous usage. As we prepare to switch
to UBL-enabled ArmClang version, remove any historical versions now.

Per https://linaro.atlassian.net/browse/TFC-515

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I1af232414dee625d7072acd945cbd985ed9e0d0f
diff --git a/jammy-amd64-tf-a-build/tf-dependencies.install b/jammy-amd64-tf-a-build/tf-dependencies.install
index c6df570..5942e2f 100755
--- a/jammy-amd64-tf-a-build/tf-dependencies.install
+++ b/jammy-amd64-tf-a-build/tf-dependencies.install
@@ -44,13 +44,6 @@
   https://releases.linaro.org/components/toolchain/binaries/6.2-2016.11/aarch64-linux-gnu/gcc-linaro-6.2.1-2016.11-x86_64_aarch64-linux-gnu.tar.xz
 tar -Jxf /tmp/gcc-linaro-x86_64_aarch64-linux-gnu.tar.xz -C ${TOOLS_DIR}
 
-# Install Arm Clang 6.9 toolchain (armclang)
-# NOTE: Toolchain is not available through PATH so to use it, CC should point to
-# CC=${TOOLS_DIR}/armclang-6.9/bin/armclang
-mkdir -p /tmp/armclang-6.9
-tar -xf /tmp/DS500-BN-00026-r5p0-11rel0.tar.gz -C /tmp/armclang-6.9
-/tmp/armclang-6.9/install_x86_64.sh --no-interactive --i-agree-to-the-contained-eula -d ${TOOLS_DIR}/armclang-6.9
-
 # Install Arm Clang 6.17 toolchain (armclang)
 mkdir -p /tmp/armclang-6.17
 tar -xf /tmp/DS500-BN-00026-r5p0-19rel0.tar.gz -C /tmp/armclang-6.17