FAPI: Fix usage of external PEM keys for PolicyAuthorize. 4.1.x #2154

Job	Run time
scanbuild	6m 54s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 43s
build-test (ubuntu-20.04, clang)	4m 18s
test-coverage	5m 18s
test-mbedtls (ubuntu-20.04)	2m 54s
build-test (fedora-32, gcc)	4m 47s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 56s
build-test (fedora-32, clang)	5m 13s
test-no-crypto-build	1m 17s
build-test (opensuse-leap, gcc)	4m 31s
test-fuzz	2m 28s
build-test (opensuse-leap, clang)	4m 58s
test-tcti-config	14m 36s
build-test (ubuntu-22.04, gcc)	4m 33s
build-test (ubuntu-22.04, clang)	4m 49s
build-test (alpine-3.15, gcc)	3m 56s
build-test (alpine-3.15, clang)	4m 55s
	1h 23m 6s

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