CMake: fix the output bin-hex file
CMake: fix the output bin-hex file

$<TARGET_FILE:${target}> is the output from CMake. As it can contain suffix for some toolchains, we can use ${target} instead (output from hex/bin generation).

mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed