FAPI: Fix usage of endorsement handle 3.2.x #1782

Job	Run time
test-mbedtls	2m 45s
test-coverage	4m 22s
scanbuild	11m 18s
test-tcti-config	10m 37s
build-test (ubuntu-18.04, gcc)	4m 10s
build-test (ubuntu-18.04, clang)	4m 29s
build-test (ubuntu-20.04, gcc)	4m 24s
test-fuzz	2m 22s
build-test (ubuntu-20.04, clang)	4m 5s
coverity-test	0s
build-test (fedora-32, gcc)	4m 46s
build-test (fedora-32, clang)	4m 41s
build-test (opensuse-leap, gcc)	4m 21s
build-test (opensuse-leap, clang)	4m 14s
	1h 6m 34s

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