Nudge lld to break the kernel read-only and read-write sections into
separate 2M pages. The binutils default for max-page-size and
common-page-size used to produce this result. By setting these
values, we can nudge lld to also separate these sections into separate
2M pages.

Reviewed by: jhb, kib
Discussed with: emaste
Sponsored by: Netflix
Differential Revision: D14282