arm: mediatek: mt8188: fix gd->bd->bi_dram[0].size

Use board_get_usable_ram_top() instead of get_effective_memsize() to
set gd->ram_top to something <= 4GiB.

Both board_get_usable_ram_top() and get_effective_memsize() are used to
set gd->ram_top in setup_dest_addr(). However, get_effective_memsize()
also sets gd->bd->bi_dram[0].size in dram_init_banksize(), which is
undesirable.

Prior to commit b3467e51e92b ("arm: mediatek: mt8188:
drop dram_init_banksize()"), gd->bd->bi_dram[0].size was overridden in
a board-specific dram_init_banksize() implementation. When that was
removed get_effective_memsize() set gd->bd->bi_dram[0].size to the wrong
value because of get_effective_memsize() being overridden in commit
7518e10cd235 ("arm: mediatek: mt8188: fix gd->ram_top limit").

We can just use board_get_usable_ram_top() now to set gd->ram_top to the
correct value instead. This is possible now, thanks to
LMB_LIMIT_DMA_BELOW_RAM_TOP being set by default for 64-bit Mediatek
ARM SoCs.

Fixes: b3467e51e92b ("arm: mediatek: mt8188: drop dram_init_banksize()")
Link: https://patch.msgid.link/[email protected]
Signed-off-by: David Lechner <[email protected]>

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