Add build type required for code coverage analysis.

Add build type required for code coverage analysis.

[Issue#]        N/A
[Bug]           N/A
[Cause]         N/A
[Solution]      N/A
[Verification]  Build project without build type provided explicitly
and with build type set to CCOV. In both cases, project should build
successfully. In second case, with CCOV build type, additional .gcno
files should be created in the projects build root. Please, verify if
they exist.

Hint: pass `--define='build_type CCOV'` to osc build command to set
build type to CCOV.

Change-Id: I320457323e17079df11ce1d300d6e3cc81e8e58a