[z/OS] Make MinGlobalAlign consistent with SystemZ Remove overriding MinGlobalAlign to 0 for z/OS target to be consistent with SystemZ. Reviewed By: abhina.sreeskantharajan Differential Revision: https://reviews.llvm.org/D106890 GitOrigin-RevId: a2d4b064644bdf146d0649c6a70e595567f1213f