tpm2_encode: Fix setting emptyAuth in generated pem file. #1878

Job	Run time
coverage-test	7m 9s
build-test (ubuntu-20.04, gcc)	5m 58s
master-tss-build-test (gcc)	17m 5s
build-test (ubuntu-20.04, clang)	5m 9s
coverity-test	0s
master-tss-build-test (clang)	5m 2s
build-test (fedora-30, gcc)	5m 52s
build-test (fedora-30, clang)	5m 21s
build-test (opensuse-leap, gcc)	6m 1s
build-test (opensuse-leap, clang)	5m 20s
build-test (fedora-32, gcc)	5m 57s
build-test (fedora-32, clang)	5m 6s
build-test (ubuntu-22.04, gcc)	10m 52s
build-test (ubuntu-22.04, clang)	10m 6s
	1h 34m 58s

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