bionic-amd64-tf-m-build: Install GCC v11.2

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: If3bd9dbfbb1d9baef9f984022494a4e5c92cd5b4
diff --git a/bionic-amd64-tf-m-build/Dockerfile b/bionic-amd64-tf-m-build/Dockerfile
index a562fdc..11fae79 100644
--- a/bionic-amd64-tf-m-build/Dockerfile
+++ b/bionic-amd64-tf-m-build/Dockerfile
@@ -14,6 +14,8 @@
 ENV GCC_7_3_1_PATH=${GCC_7_3_1_DIR}/bin
 ENV GCC_10_3_DIR=${COMPILER_DIR}/gcc-10-3
 ENV GCC_10_3_PATH=${GCC_10_3_DIR}/bin
+ENV GCC_11_2_DIR=${COMPILER_DIR}/gcc-11-2
+ENV GCC_11_2_PATH=${GCC_11_2_DIR}/bin
 ENV ARMCLANG_6_13_DIR=${COMPILER_DIR}/armclang-6-13
 ENV ARMCLANG_6_13_PATH=${ARMCLANG_6_13_DIR}/bin
 ENV PKG_DEPS="\