keymile: Make distinct kmtegr1, kmvect1, suvd3 configs

keymile: Make distinct kmtegr1, kmvect1, suvd3 configs

The kmtegr1, kmvect1, and suvd3 boards all use the same config include
file with lots of #ifdefs in it.

The Kconfig migation will become easier if we get rid of these #ifdefs
first.

Hence, create distinct config include files for these boards, and unwind
the #ifdef logic in these config files to only include the options
necessary for each board.

Signed-off-by: Mario Six <mario.six@gdsys.cc>