Deduplicate hm2 driver code and constants #11200

Job	Run time
htmldocs	27m 19s
cppcheck	2m 4s
package-indep (debian:bullseye)	42m 56s
package-arch (debian:bullseye)	29m 10s
package-indep (debian:bookworm)	33m 33s
package-arch (debian:bookworm)	29m 53s
rip-and-test-clang	29m 17s
package-indep (debian:sid)	37m 47s
rip-and-test	29m 13s
package-arch (debian:sid)	30m 4s
	4h 51m 16s

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