uki: Make function `get_text_section` public #496

Job	Run time
build (uki, fedora)	6m 32s
build (bls, arch)	4m 57s
build (bls, fedora)	8m 24s
build (unified, fedora)	8m 39s
build (bls, arch, xfs, none)	7m 28s
build (bls, fedora-compat)	6m 27s
build (bls, rawhide)	8m 9s
build (uki, arch)	7m 21s
build (bls, rhel9)	8m 48s
build (bls, arch, ext4, none)	5m 51s
build (unified-secureboot, fedora)	7m 1s
	1h 19m 37s

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