tests: Add tmp105 qtest test case

Exercise all four commands of the TMP105, testing for an issue in the
I2C TX path.

The test case uses the N800's OMAP I2C and is the first for ARM.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>