refac(hal_x86_64): misc interrupt module cleanup #1415

Job	Run time
changed_paths	7s
clippy	2m 45s
cargo test (host)	4m 40s
cargo check (host)	3m 36s
build boot image (x86_64)	3m 9s
docs	4m 17s
Loom tests (cordyceps)	1m 25s
cargo test (cross x64)	5m 10s
Miri tests (cordyceps)	1m 59s
rustfmt	12s
Loom tests (maitake)	4m 12s
Tests (maitake, no-default-features)	1m 37s
Miri tests (maitake)	19m 9s
all_systems_go	1s
	52m 19s

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