f2fs: describe node tree geometry dynamically

The file indexing tree boundaries separating direct, indirect, and
double-indirect node blocks depend on the number of data block addresses
and node IDs contained in each node block.

Parameterize index boundary macros (NODE_DIR1_BLOCK,
NODE_DIR2_BLOCK, NODE_IND1_BLOCK, NODE_IND2_BLOCK, and NODE_DIND_BLOCK) and
address capacity helpers (DEF_ADDRS_PER_BLOCK, NIDS_PER_BLOCK,
cur_addrs_per_inode, addrs_per_page, and addrs_per_folio) with
struct f2fs_sb_info *sbi.

Update file mapping, block allocation, truncate, garbage collection,
and recovery paths to compute indexing tree offsets from the runtime
geometry.

Signed-off-by: Kelvin Zhang <zhangxp1998@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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