Remove use of deprecated rprint functions

For each of the rprint functions, there is a corresponding gen_print function
that can be used instead.

Change-Id: I89c6e0b63cac7aee92da7dc7945e413001287967
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/systest/proc_freq_check.robot b/systest/proc_freq_check.robot
index 69d14ee..d37e9f8 100755
--- a/systest/proc_freq_check.robot
+++ b/systest/proc_freq_check.robot
@@ -24,7 +24,7 @@
     ${actual_min_freq}=  Get CPU Min Frequency
     ${min_freq_designated_lower_limit}=  Get CPU Min Frequency Limit
 
-    Rprintn
+    Printn
     Rpvars  actual_min_freq  min_freq_designated_lower_limit
 
     ${err_msg}=  Catenate  Reported CPU frequency below designated limit.