Remove GCC toolchain as we never actually use it.

Bug: 132428451
Change-Id: I7dba1564bf2a54d3159b76c39afb249334ae6095
diff --git a/docs/GettingStarted.md b/docs/GettingStarted.md
index 4ece4ec..b208175 100644
--- a/docs/GettingStarted.md
+++ b/docs/GettingStarted.md
@@ -22,7 +22,7 @@
 Install prerequisites:
 
 ```shell
-sudo apt install make binutils-aarch64-linux-gnu aarch64-linux-gnu-gcc device-tree-compiler libssl-dev flex bison
+sudo apt install make binutils-aarch64-linux-gnu device-tree-compiler libssl-dev flex bison
 ```
 
 By default, the hypervisor is built with clang for a few target platforms along