Remove deprecated 'autoscr' command/variables

The more standard 'source' command provides identical functionality to
the autoscr command.

Environment variable names/values on the MVBC_P, MVBML7, kmeter1,
mgcoge, and km8xx boards are updated to no longer refernce 'autoscr'.

The 'autoscript' and 'autoscript_uname' environment variables are
also removed.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Acked-by: Andre Schwarz <andre.schwarz@matrix-vision.de>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/doc/README.m52277evb b/doc/README.m52277evb
index bec77b4..40f9028 100644
--- a/doc/README.m52277evb
+++ b/doc/README.m52277evb
@@ -184,7 +184,6 @@
 ->
 -> help
 ?       - alias for 'help'
-autoscr - run script from memory
 base    - print or set address offset
 bdinfo  - print Board Info structure
 boot    - boot default, i.e., run 'bootcmd'
@@ -227,5 +226,6 @@
 saveenv - save environment variables to persistent storage
 setenv  - set environment variables
 sleep   - delay execution for some time
+source  - run script from memory
 version - print monitor version
 ->