constify struct cfattach

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

Calling a detach function from an attach function is no longer legal (
see a recent subr_autoconf.c commit). To resolve this problem, mark the
other attachment dead, and clean it up when the first s

Calling a detach function from an attach function is no longer legal (
see a recent subr_autoconf.c commit). To resolve this problem, mark the
other attachment dead, and clean it up when the first servicing timeout
gets run.
ok kettenis

show more ...

support w83627dhg at i2c (as seen on Sun Ultra 24 via dmesg@) ok deraadt@

Rename lm_i2c.c to lm78_i2c.c.
requested by deraadt@