Can you check the full part number? There appears to be a couple versions of this chip, one with ID 0x4018 (like the existing W25Q128.V chips) and another version with additional instructions that identifies with 0x7018.

I found a W25Q128JVSIQ and it reads/writes successfully with the existing code. If your chip ends with an 'M' instead of a 'Q' then you can try this, which just does as Nico suggested: https://review.coreboot.org/#/c/22567/