- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r279963: Fix SATA Gen3 speed constants.

MFC r258779,r258780,r258787,r258822:

Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit. Instead use (1U << 31) which gets the
expected result.

Similar to the (1 << 31) case it is not defined to do (2 << 30).

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- Limit r214102 workaround to only x86. On arm it causes more problems
then solves because of cache coherency issues. This fixes periodic error
messages on console and command timeouts.
- Patch SATA PHY configuration for 65nm SoCs to improve SNR same as
Linux does.

MFC after: 2 weeks

Adjust mvs(4) to handle interrupt cause reg depending on the actual number of
channels available

- current code treats bits 4:7 in 'SATAHC interrupt mask' and 'SATAHC
interrupt cause' as flags for SATA channels 2 and 3

- for embedded SATA controllers (SoC) these bits have been marked as reserved
in datasheets so far, but for some new and upcoming chips they are used for
purposes other than SATA

Submitted by: Lukasz Plachno
Reviewed by: mav
Obtained from: Semihalf
MFC after: 2 weeks

Fix some English grammar.

Refactor hard-reset implementation in mvs(4).

Instead of spinning in a tight loop for up to 15 seconds, polling for device
readiness while it spins up, return reset completion just after PHY reports
"connect well" or 100ms connection timeout. If device was found, use callout
for checking device readiness with 100ms period up to full 31 second timeout.

This fixes system freeze for 5-10 seconds on drives hot plug-in.

Implement automatic SCSI sense fetching for mvs(4).

Make few improvements/changes to ATAPI PIO support to pass most of scgcheck
(cdrtools) tests.

Import mvs(4) - Marvell 88SX50XX/88SX60XX/88SX70XX/SoC SATA controllers
driver for CAM ATA subsystem. This driver supports same hardware as
atamarvell, ataadaptec and atamvsata drivers from ata(4), but provides
many additional features, such as NCQ, PMP, etc.