Some ColdFire CPU UART hardware modules can configure the IRQ they use.
Currently the same setup code is duplicated in the init code for each of
these ColdFire CPUs. Merge all this code to a single instance.
Signed-off-by: NGreg Ungerer <gerg@uclinux.org>

The ColdFire UART is common to all ColdFire CPU's. No need to duplicate
its platform setup code for every CPU family member. Merge all the setup
code into a single shared file.
Signed-off-by: NGreg Ungerer <gerg@uclinux.org>