Add uart driver for Qualcomm MSM 7000/8000 series chips.
It is working on IFC6410 board which has Qualcomm Snapdragon SoC.

Approved by:    stas (mentor)


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272399 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f