arch: ARM: set -mabi and -march in linker flags

Some toolchains are built with multilib enabled in order to provide
multiple versions of the same library, optimized for different ABI
or architecture. They require the -march= and -mabi= options to be
passed at link time. This is important for example when linking with
newlib.

We do that by passing zephyr_ld_options the same arguments than
zephyr_compile_options. The -mabi option is passed directly while the
-march option, if defined, is passed through ${ARCH_FLAG}.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

arch/arm/CMakeLists.txt

@@ -17,4 +17,9 @@ zephyr_compile_options(
   ${ARCH_FLAG}
   )
 
+zephyr_ld_options(
+  -mabi=aapcs
+  ${ARCH_FLAG}
+  )
+
 add_subdirectory(core)