travis: cleanup fuzzing target
travis: cleanup fuzzing target

Remove unneeded configure options.
Remove unneeded if block.
Invert the ./configure --enable=no to
./configure --disable for tcti device and tcti mssim.

Signed-off-by: Tadeusz Struk <ac7da5bc34fbda078ba4af5ef710d2a59a2316f5@intel.com>

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