fs_mgr: Always mount tmpfs with MS_NOEXEC

This change adds MS_NOEXEC to the list of flags used in
fs_mgr_do_tmpfs_mount().

Bug: 62419743
Test: aosp_bullhead-eng still boots
Change-Id: I3ee3bb825a59437eba48e3a5b898dd2e385a9ab7
1 file changed