MFC r258353: zfs page_busy: fix the boundaries of the cleared range

This is a fix for a regression introduced in r246293.

vm_page_clear_dirty expects the range to have DEV_BSIZE aligned boundaries,
otherwise it extends them.  Thus it can happen that the whole page is
marked clean while actually having some small dirty region(s).
This commit makes the range properly aligned and ensures that only
the clean data is marked as such.

It would interesting to evaluate how much benefit clearing with DEV_BSIZE
granularity produces.  Perhaps instead we should clear the whole page
when it is completely overwritten and don't bother clearing any bits
if only a portion a page is written.
MFC r258389: MFV r258378: 4089 NULL pointer dereference in arc_read()

illumos/illumos-gate@57815f6b95a743697e148327725b7f568e75e6ea
MFV r258377: 4088 use after free in arc_release()

illumos/illumos-gate@ccc22e130479b5bd7c0002267fee1e0602d3f772