arm64: versal2: Populate DRAM banks before page table size calculation

Move DRAM bank detection from fdtdec to custom implementation to
ensure memory banks are populated before get_page_table_size() is
called during MMU initialization.

The current fdtdec-based approach populates gd->bd->bi_dram[] too
late in the boot sequence, causing get_page_table_size() to be
called with unpopulated DRAM information. This prevents dynamic
page table sizing based on actual memory configuration.

Parse /memory nodes in dram_init() to fill versal2_mem_map[]
early enough for MMU setup. Supports up to
CONFIG_NR_DRAM_BANKS (36) non-contiguous banks with high memory
regions (>4GB) and use __weak get_page_table_size implementation
to estimate page table size based on the populated DRAM banks.

Signed-off-by: Pranav Sanwal <[email protected]>
Signed-off-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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