powerpc: mpc8xx: delete an unused source file

References to the wireless keyboard should also be removed
from README.console.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Wolfgang Denk <wd@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
diff --git a/doc/README.console b/doc/README.console
index c9ef59e..e7970ed 100644
--- a/doc/README.console
+++ b/doc/README.console
@@ -25,7 +25,7 @@
 assigning its name to the corresponding environment variable. For
 example:
 
-    setenv stdin wl_kbd		<- To use the wireless keyboard
+    setenv stdin serial		<- To use the serial input
     setenv stdout video		<- To use the video console
 
 Do a simple "saveenv" to save the console settings in the environment