FAPI: Fix usage of endorsement handle 3.2.x #1752

Job	Run time
coverity-test	0s
scanbuild	11m 16s
build-test (ubuntu-18.04, gcc)	4m 16s
test-coverage	4m 42s
build-test (ubuntu-18.04, clang)	4m 18s
test-fuzz	2m 22s
test-mbedtls	2m 49s
build-test (ubuntu-20.04, gcc)	4m 30s
test-tcti-config	10m 37s
build-test (ubuntu-20.04, clang)	4m 10s
build-test (fedora-32, gcc)	4m 45s
build-test (fedora-32, clang)	4m 33s
build-test (opensuse-leap, gcc)	4m 32s
build-test (opensuse-leap, clang)	4m 13s
	1h 7m 3s

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