Change ENABLE_KSM to $ENABLE_KSM

* Since ENABLE_KSM param will be used in local.conf file
  and it's value is received in a variable and while compairing,
  the variable needs to be compared. So we need to change the
  same.

Change-Id: Id4ed17c0642acd2313e456503cfc375ca6f61409
Closes-Bug: #1724690
1 file changed