Disable checkSystemServerOrder

checkSystemServerOrder is blocking switching a release branch to prebuilts
after I1a92ff461d4706cf68a0b8b37e53dea412efb8bf.  The current
implementation blindly walks all dependencies, which means it can
follow a bootclasspath dependency into an apex and then accidentally
examine system server jars in that apex.  Disable it for now.

Bug: 380084017
Bug: 397461231
Test: builds
Change-Id: I4ffe56305b784b9c5498870d4a3b95d9b4984e59