srs/amarisoft{ue,enb}: Fix b200 specific rf_dev_args

Commit 12ae6d79a5b53a213f619999ef0230c1dae88bb7 switched the rf_dev_type
to be in lowercase but forgot to change these conditions.

Change-Id: I91d3877381b4e6343dc4aa0465e699341ed6648d
diff --git a/doc/manuals/chapters/config_mangling.adoc b/doc/manuals/chapters/config_mangling.adoc
index 310b15f..e579732 100644
--- a/doc/manuals/chapters/config_mangling.adoc
+++ b/doc/manuals/chapters/config_mangling.adoc
@@ -188,7 +188,7 @@
 
 - label: srsENB-B200
   type: srsenb
-  rf_dev_type: UHD
+  rf_dev_type: uhd
   rf_dev_args: "type=b200,serial=317B9FE"
   remote_user: jenkins
   addr: 10.12.1.206