Fix TOP_SOURCEDIR not found error when enable unit test checks only without integration tests
Fix TOP_SOURCEDIR not found error when enable unit test checks only without integration tests

Signed-off-by: Jian-Ding Chen (timchen119) <48547772ac3b149584aadd2f66bab91936ad564d@canonical.com>

01org/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS