Centralize guest physical layout logic #5691

Job	Run time
quick check [fmt, clippy x64-linux]	0s
test flowey local backend	0s
xtask fmt (windows)	0s
build artifacts (shared VMM tests) [windows]	0s
build artifacts (for VMM tests) [x64-linux]	0s
clippy [x64-windows], unit tests [x64-windows]	0s
clippy [aarch64-linux-musl, misc nostd], unit tests [aarch64-linux-musl]	0s
build artifacts (for VMM tests) [x64-windows]	0s
build artifacts (not for VMM tests) [aarch64-windows]	0s
build openhcl [x64-linux]	0s
build openhcl (mi-secure) [x64-linux]	0s
build artifacts (shared VMM tests) [linux]	0s
build artifacts (not for VMM tests) [x64-windows]	0s
run vmm-tests [aarch64-windows]	0s
build openhcl [aarch64-linux]	0s
build artifacts (for VMM tests) [aarch64-windows]	0s
clippy [x64-linux-musl, misc nostd], unit tests [x64-linux-musl]	0s
clippy [aarch64-windows], unit tests [aarch64-windows]	0s
build artifacts (for VMM tests) [aarch64-linux]	0s
clippy [aarch64-linux], unit tests [aarch64-linux]	0s
run vmm-tests [x64-linux-intel-mshv]	0s
run vmm-tests [x64-windows-intel]	0s
run vmm-tests [x64-windows-intel-tdx]	0s
run vmm-tests [x64-windows-amd-snp]	0s
run vmm-tests [x64-linux-amd-kvm]	0s
run vmm-tests [x64-windows-intel-mi-secure]	0s
run vmm-tests [x64-windows-amd]	0s
clippy [macos], unit tests [x64-linux]	-6s
	-6s

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