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>
diff --git a/configs/kmvect1_defconfig b/configs/kmvect1_defconfig
index 74b688f..2f71ee7 100644
--- a/configs/kmvect1_defconfig
+++ b/configs/kmvect1_defconfig
@@ -1,7 +1,7 @@
 CONFIG_PPC=y
 CONFIG_SYS_TEXT_BASE=0xF0000000
 CONFIG_MPC83xx=y
-CONFIG_TARGET_SUVD3=y
+CONFIG_TARGET_KMVECT1=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_SYS_EXTRA_OPTIONS="KMVECT1"