Update default variable values for compilers

Signed-off-by: Gowtham Suresh Kumar <gowtham.sureshkumar@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 4a59026..3e95645 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -175,10 +175,10 @@
     : ${ARMC6_BIN_DIR:=/usr/bin}
     : ${ARM_NONE_EABI_GCC_PREFIX:=arm-none-eabi-}
     : ${ARM_LINUX_GNUEABI_GCC_PREFIX:=arm-linux-gnueabi-}
-    : ${CLANG_LATEST:="clang-16"}
-    : ${CLANG_EARLIEST:="clang-3.5"}
-    : ${GCC_LATEST:="gcc-12"}
-    : ${GCC_EARLIEST:="gcc-4.7"}
+    : ${CLANG_LATEST:="clang-latest"}
+    : ${CLANG_EARLIEST:="clang-earliest"}
+    : ${GCC_LATEST:="gcc-latest"}
+    : ${GCC_EARLIEST:="gcc-earliest"}
 
     # if MAKEFLAGS is not set add the -j option to speed up invocations of make
     if [ -z "${MAKEFLAGS+set}" ]; then