KokkosClassic: Fix missing file in instal

A header file wasn't being added to the sources of a library and
wasn't being included in an install. This fixes that.

Build/Test Cases Summary
Enabled Packages: KokkosClassic
Enabled all Forward Packages
0) MPI_DEBUG => passed: passed=717,notpassed=0 (240.87 min)
1) SERIAL_RELEASE => passed: passed=673,notpassed=0 (47.73 min)