mtk_spi_v2 hack

From: Mori Hiroki <yamori813_at_yahoo.co.jp>
Date: Sun, 30 Jun 2024 00:12:40 UTC
Hi

I hacked MT7628 spi read access.

https://github.com/ZRouter/freebsd-src/commit/b0efa0f0cd83e62f29ce879b5023d27c71dc99e9

About 300% faster than byte access.