arch, mm: consolidate initialization of SPARSE memory model

arch, mm: consolidate initialization of SPARSE memory model

Every architecture calls sparse_init() during setup_arch() although the
data structures created by sparse_init() are not used until the
initialization of the core MM.

Beside the code duplication, calling sparse_init() from architecture
specific code causes ordering differences of vmemmap and HVO
initialization on different architectures.

Move the call to sparse_init() from architecture specific code to
free_area_init() to ensure that vmemmap and HVO initialization order is
always the same.

Link: https://lkml.kernel.org/r/20260111082105.290734-25-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <redacted>
Cc: Alexander Gordeev <redacted>
Cc: Alex Shi <redacted>
Cc: Andreas Larsson <redacted>
Cc: "Borislav Petkov (AMD)" <redacted>
Cc: Catalin Marinas <redacted>
Cc: David Hildenbrand <redacted>
Cc: David S. Miller <redacted>
Cc: Dinh Nguyen <redacted>
Cc: Geert Uytterhoeven <redacted>
Cc: Guo Ren <redacted>
Cc: Heiko Carstens <redacted>
Cc: Helge Deller <redacted>
Cc: Huacai Chen <redacted>
Cc: Ingo Molnar <redacted>
Cc: Johannes Berg <redacted>
Cc: John Paul Adrian Glaubitz <redacted>
Cc: Jonathan Corbet <redacted>
Cc: Klara Modin <redacted>
Cc: Liam Howlett <redacted>
Cc: Lorenzo Stoakes <redacted>
Cc: Magnus Lindholm <redacted>
Cc: Matt Turner <redacted>
Cc: Max Filippov <redacted>
Cc: Michael Ellerman <redacted>
Cc: Michal Hocko <redacted>
Cc: Michal Simek <redacted>
Cc: Muchun Song <redacted>
Cc: Oscar Salvador <redacted>
Cc: Palmer Dabbelt <redacted>
Cc: Pratyush Yadav <redacted>
Cc: Richard Weinberger <redacted>
Cc: "Ritesh Harjani (IBM)" <redacted>
Cc: Russell King <redacted>
Cc: Stafford Horne <redacted>
Cc: Suren Baghdasaryan <redacted>
Cc: Thomas Bogendoerfer <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Vasily Gorbik <redacted>
Cc: Vineet Gupta <redacted>
Cc: Vlastimil Babka <redacted>
Cc: Will Deacon <redacted>
Signed-off-by: Andrew Morton <redacted>