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/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index e41f4d1..59e0c9a 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -89,9 +89,19 @@
 
 config TARGET_SUVD3
 	bool "Support suvd3"
-	select ARCH_MPC8309 if SYS_EXTRA_OPTIONS="KMTEGR1"
-	select ARCH_MPC8309 if SYS_EXTRA_OPTIONS="KMVECT1"
-	select ARCH_MPC832X if SYS_EXTRA_OPTIONS="SUVD3"
+	select ARCH_MPC832X
+	imply CMD_CRAMFS
+	imply FS_CRAMFS
+
+config TARGET_KMVECT1
+	bool "Support kmvect1"
+	select ARCH_MPC8309
+	imply CMD_CRAMFS
+	imply FS_CRAMFS
+
+config TARGET_KMTEGR1
+	bool "Support kmtegr1"
+	select ARCH_MPC8309
 	imply CMD_CRAMFS
 	imply FS_CRAMFS