Revert "sim:tests: Fix shodan_boot_test_robot to set gdb_port"

This reverts commit e38c1da2d6086b3a1170a05254d8d5849f175619.

Reason for revert: AntMicro fixed the bug upstream.

Change-Id: I5e01b00123b79c97dc5fa605672a15f847f3515d

shodan_boot.robot

diff --git a/shodan_boot.robot b/shodan_boot.robot
index f7595d6..e8c135c 100644
--- a/shodan_boot.robot
+++ b/shodan_boot.robot
@@ -19,7 +19,6 @@
 *** Keywords ***
 Prepare Machine
     Execute Command             path set ${ROOTDIR}
-    Execute Command             \$gdb_port = 3333
     Execute Script              ${SCRIPT}
     Execute Command             cpu0 IsHalted false
     Set Default Uart Timeout    300