remove pico_arm_clang_arm.cmake (#2892)

cmake/preload/toolchains/pico_arm_clang_arm.cmake

diff --git a/cmake/preload/toolchains/pico_arm_clang_arm.cmake b/cmake/preload/toolchains/pico_arm_clang_arm.cmake
deleted file mode 100644
index 4c78165..0000000
--- a/cmake/preload/toolchains/pico_arm_clang_arm.cmake
+++ /dev/null
@@ -1,39 +0,0 @@
-#  i.e. CMake<Lang>Information and whatnot
-include(${CMAKE_CURRENT_LIST_DIR}/util/find_compiler.cmake)
-
-# include our Platform/PICO.cmake
-set(CMAKE_SYSTEM_NAME PICO)
-set(CMAKE_SYSTEM_PROCESSOR cortex-m0plus)
-
-# Find ARMClang.
-pico_find_compiler(PICO_COMPILER_CC armclang)
-pico_find_compiler(PICO_COMPILER_CXX armclang)
-pico_find_compiler(PICO_COMPILER_ASM armasm)
-set(PICO_COMPILER_ASM "${PICO_COMPILER_ASM}" CACHE INTERNAL "")
-pico_find_compiler(PICO_OBJCOPY llvm-objcopy)
-pico_find_compiler(PICO_OBJDUMP llvm-objdump)
-
-# Specify the cross compiler.
-set(CMAKE_C_COMPILER ${PICO_COMPILER_CC} CACHE FILEPATH "C compiler")
-set(CMAKE_CXX_COMPILER ${PICO_COMPILER_CXX} CACHE FILEPATH "C++ compiler")
-set(CMAKE_C_OUTPUT_EXTENSION .o)
-
-# todo should we be including CMakeASMInformation anyway - i guess that is host side
-set(CMAKE_ASM_COMPILER ${PICO_COMPILER_ASM} CACHE FILEPATH "ASM compiler")
-set(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>   -c <SOURCE>")
-set(CMAKE_INCLUDE_FLAG_ASM "-I")
-set(CMAKE_OBJCOPY ${PICO_OBJCOPY} CACHE FILEPATH "")
-set(CMAKE_OBJDUMP ${PICO_OBJDUMP} CACHE FILEPATH "")
-
-# Add target system root to cmake find path.
-get_filename_component(PICO_COMPILER_DIR "${PICO_COMPILER_CC}" DIRECTORY)
-get_filename_component(CMAKE_FIND_ROOT_PATH "${PICO_COMPILER_DIR}" DIRECTORY)
-
-# Look for includes and libraries only in the target system prefix.
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-
-set(ARM_TOOLCHAIN_COMMON_FLAGS " --cpu=Cortex-M0plus")
-include(${CMAKE_CURRENT_LIST_DIR}/util/set_flags.cmake)