Build fix:  Only <sys/cdefs.h> should be included before __FBSDID().
<sys/param.h> needs to be included after any "opt_foo.h" headers so it
sees the same set of defined macros as other headers.
Eliminate unnecessary vm object locking from tmpfs_nocacheread().
Add myself to committers-src.dot, and note kib is my mentor.

Approved by:	kib (mentor)