Mtk_eth_soc will use even more ram with upstream patch

I'm talking about "net: ethernet: mtk_eth_soc: handle dma buffer size soc specific"
https://lore.kernel.org/all/20240603192505.217881-1-linux@fw-web.de/

For mt7621

current build:

fq_dma_size = 2K
tx.dma_size = 2K
rx.dma_size = 512

after patch:

fq_dma_size = 2K
tx.dma_size = 2K
rx.dma_size = **2K**

it's even possible to use much less ram:

fq_dma_size = 512
tx.dma_size = 1024
rx.dma_size = 16

from https://github.com/blocktrron/nwa50ax-gpl/blob/master/openwrt/autobuild/mt7621-mt7915-AP-128M/target/linux/ramips/patches-4.4/0999-eth-mem-reduced.patch

With reduced ram config I did't have any problems with 500mbps ISP. So I think that "Low RAM Configuration" option could be created. ~9MB is quite big number for some devices|configs (If I'm not mistaken about size)