powerpc/fadump: Reserve page-aligned boot_memory_size during fadump_reserve_mem

This patch refactors all CMA related initialization and alignment code
to within fadump_cma_init() which gets called in the end. This also means
that we keep [reserve_dump_area_start, boot_memory_size] page aligned
during fadump_reserve_mem(). Then later in fadump_cma_init() we extract the
aligned chunk and provide it to CMA. This inherently also fixes an issue in
the current code where the reserve_dump_area_start is not aligned
when the physical memory can have holes and the suitable chunk starts at
an unaligned boundary.

After this we should be able to call fadump_cma_init() independently
later in setup_arch() where pageblock_order is non-zero.

Suggested-by: Sourabh Jain <[email protected]>
Acked-by: Hari Bathini <[email protected]>
Reviewed-by: Madhavan Srinivasan <[email protected]>
Signed-off-by: Ritesh Harjani (IBM) <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://patch.msgid.link/805d6b900968fb9402ad8f4e4775597db42085c4.1729146153.git.ritesh.list@gmail.com

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