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/board/keymile/km83xx/Kconfig b/board/keymile/km83xx/Kconfig
index d6c594c..d52ee91 100644
--- a/board/keymile/km83xx/Kconfig
+++ b/board/keymile/km83xx/Kconfig
@@ -11,6 +11,32 @@
 
 endif
 
+if TARGET_KMVECT1
+
+config SYS_BOARD
+	default "km83xx"
+
+config SYS_VENDOR
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	default "kmvect1"
+
+endif
+
+if TARGET_KMTEGR1
+
+config SYS_BOARD
+	default "km83xx"
+
+config SYS_VENDOR
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	default "kmtegr1"
+
+endif
+
 if TARGET_SUVD3
 
 config SYS_BOARD