net: ethernet: mtk_eth_soc: enable page_pool support for MT7988 SoC

In order to recycle pages, enable page_pool allocator for MT7988 SoC.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/fd4e8693980e47385a543e7b002eec0b88bd09df.1690440675.git.lorenzo@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>