fapi: remove deprecated index function. #446

Job	Run time
scanbuild	10m 50s
test-coverage	7m 39s
build-test (ubuntu-18.04, gcc)	8m 26s
build-test (ubuntu-18.04, clang)	7m 25s
build-test (ubuntu-20.04, gcc)	9m 25s
build-test (ubuntu-20.04, clang)	6m 13s
build-test (fedora-32, gcc)	7m 56s
build-test (fedora-32, clang)	7m 30s
build-test (opensuse-leap, gcc)	7m 2s
build-test (opensuse-leap, clang)	6m 32s
build-test (ubuntu-22.04, gcc)	10m 46s
build-test (ubuntu-22.04, clang)	7m 52s
build-test (alpine-3.15, gcc)	5m 53s
build-test (alpine-3.15, clang)	7m 56s
coverity-test	0s
test-fuzz	3m 58s
test-no-crypto-build	2m 3s
test-mbedtls (ubuntu-20.04)	4m 37s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	3m 46s
test-tcti-config	19m 34s
	2h 25m 23s

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