keymile: Make distinct kmsupx5, tuge1, kmopti2, and kmtepr2 configs

The kmsupx5, tuge1, kmopti2, and kmtepr2 boards all build from the same
include config file with lots of #ifdef logic.

To ease Kconfig migration, create new config include files for these
boards, and resolve the #ifdef logic as needed.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/kmopti2_defconfig b/configs/kmopti2_defconfig
index e8e821f..c0927dd 100644
--- a/configs/kmopti2_defconfig
+++ b/configs/kmopti2_defconfig
@@ -1,10 +1,9 @@
 CONFIG_PPC=y
 CONFIG_SYS_TEXT_BASE=0xF0000000
 CONFIG_MPC83xx=y
-CONFIG_TARGET_TUXX1=y
+CONFIG_TARGET_KMOPTI2=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="KMOPTI2"
 CONFIG_MISC_INIT_R=y
 CONFIG_VERSION_VARIABLE=y
 CONFIG_BOARD_EARLY_INIT_R=y