tpm2_hash: Change default hashing alg from sha1 to sha256 #650

Job	Run time
coverage-test	35s
master-tss-build-test (gcc)	34s
coverity-test	0s
master-tss-build-test (clang)	36s
build-test (ubuntu-18.04, gcc)	44s
build-test (ubuntu-18.04, clang)	36s
build-test (ubuntu-20.04, gcc)	34s
build-test (ubuntu-20.04, clang)	43s
build-test (fedora-30, gcc)	30s
build-test (fedora-30, clang)	28s
build-test (opensuse-leap, gcc)	44s
build-test (opensuse-leap, clang)	46s
build-test (fedora-32, gcc)	29s
build-test (fedora-32, clang)	30s
build-test (ubuntu-22.04, gcc)	36s
build-test (ubuntu-22.04, clang)	43s
	9m 8s

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