board: ge: bx50v3: remove redundant targets

This replaces TARGET_GE_B{4,6,8}50V3 with common TARGET_GE_BX50V3.
The boards are identified automatically at runtime.

Signed-off-by: Ian Ray <ian.ray@ge.com>
Signed-off-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
diff --git a/board/ge/bx50v3/Kconfig b/board/ge/bx50v3/Kconfig
index d50dece..993b055 100644
--- a/board/ge/bx50v3/Kconfig
+++ b/board/ge/bx50v3/Kconfig
@@ -1,4 +1,4 @@
-if TARGET_GE_B450V3 || TARGET_GE_B650V3 || TARGET_GE_B850V3
+if TARGET_GE_BX50V3
 
 config IMX_CONFIG
 	default "board/ge/bx50v3/bx50v3.cfg"