Add blob vgabios Intel for T530

[redneuromancer]

I've extracted the vgabios from official source using Head's script: https://github.com/linuxboot/heads/blob/master/blobs/xx30/vbios_t530.sh

The script outputs 2 blobs:

• 10de,0def.rom (Nvidia)
• 8086,0106.rom (Intel)

I've taken the intel one and renamed it to vgabios.bin , as per what's done for X230.

I will commit further changes separately.

Reasoning for this is in #316