riscv: Handle hardware-managed dirty bit updates in pmap_promote_l2()

riscv: Handle hardware-managed dirty bit updates in pmap_promote_l2()

pmap_promote_l2() failed to handle implementations which set the
accessed and dirty flags.  In particular, when comparing the attributes
of a run of 512 PTEs, we must handle the possibility that the hardware
will set PTE_D on a clean, writable mapping.

Following the example of amd64 and arm64, change riscv's
pmap_promote_l2() to downgrade clean, writable mappings to read-only, so
that updates are synchronized by the pmap lock.

Fixes:		f6893f09d
Reported by:	Nathaniel Filardo <nwf20@cl.cam.ac.uk>
Tested by:	Nathaniel Filardo <nwf20@cl.cam.ac.uk>
Reviewed by:	jrtc27, alc, Nathaniel Filardo
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D30644