MPC7xx: remove obsolete "BAB7xx" board

The BAB7xx boards are almost deceased.  They cause build warnings, an
it's not worth the effort to fix these.  Remove the dead body.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Frank Gottschling <fgottschling@eltec.de>
diff --git a/CREDITS b/CREDITS
index dead57d..933104c 100644
--- a/CREDITS
+++ b/CREDITS
@@ -161,7 +161,7 @@
 
 N: Frank Gottschling
 E: fgottschling@eltec.de
-D: Support for ELTEC MHPC/BAB7xx/ELPPC boards, cfb-console, i8042, SMI LynxEM
+D: Support for ELTEC MHPC/ELPPC boards, cfb-console, i8042, SMI LynxEM
 W: www.eltec.de
 
 N: Marius Groeger
@@ -183,7 +183,7 @@
 
 N: Andreas Heppel
 E: aheppel@sysgo.de
-D: CPU Support for MPC 75x; board support for Eltec BAB750 [obsolete!]
+D: CPU Support for MPC 75x
 
 N: Josh Huber
 E: huber@alum.wpi.edu