This commit updates the CMake reference file names for custom
toolchains.
The contents of `cmake/generic_toolchain.cmake` and
`cmake/target_toolchain.cmake` were moved
`cmake/modules/FindHostTools.cmake` and
`cmake/modules/FindTargetTools.cmake`, respectively.
Refer to the commit 8d2998d4f9 and
7131d02fa4 for more details.
Signed-off-by: Stephanos Ioannidis <stephanos.ioannidis@nordicsemi.no>
a041f5ce10