MFC r274819:
Prevent overflow issues in timeout processing

MFC r274852:
Fix build with asr driver

Sponsored by: Multiplay

MFC: r267852

Fixed an IIC timing issue between the glxiic master and a slave of
peripheral devices. When transmitting (rx) from slave to master,
sometimes nAKC delays. As a result, some slaves fails their
transmission.

Submitted by: Masanori OZAWA <ozawa@ongs.co.jp>
Reviewed by: brix

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

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

This isn't functionally identical. In some cases a hint to disable
unit 0 would in fact disable all units.

This reverts r241856

Approved by: cperciva (implicit)

Now that device disabling is generic, remove extraneous code from the
device drivers that used to provide this feature.

Reviewed by: des
Approved by: cperciva
MFC after: 1 week

Fix breakage on pc98 by redefining DEBUG().

Pointy hat to: brix

Add I2C bus driver for the AMD Geode LX series CS5536 Companion
Device.

Reviewed by: jhb (newbus bits only), adrian