[Script] Simplify pointless boolean expressions

* Run "Pointless boolean expression inspection" in Intellij
* Fix issues like
   a == false -> !a
   a == true -> a
   a != true -> !a
   a != false -> a

Bug: 63597465
Test: make checkbuild, no manual changes, no functional changes
Change-Id: I303e8ee7c1cb0d76ccd86edcb08c6e763e2aa7ea