Build: Refactor toolchain files
Change from a CMAKE toolchain file to a TFM toolchain file, avoiding
some abuses of the CMAKE_TOOLCHAIN_FILE that were used as a workaround
for compiler setup. Also add the CROSS_COMPILE variable. Bump cmake
required version to 3.15.
Change-Id: I0948033045e2d2f34beffa807925fc7375098335
Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index f227c6e..85f63f0 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -5,7 +5,7 @@
#
#-------------------------------------------------------------------------------
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.15)
add_custom_target(docs)