tgl: Update VBTs and GOP drivers

[crawfxrd]

• Update Intel GOP driver to 17.0.1077
• Update VBT to 250

Test:

• Boot splash displays on screen
• Firmware setup menu is rendered, at correct resolution

Affects:

• [x] darp7
• [x] galp5
• [x] gaze16-3050
• [x] gaze16-3060
• [x] gaze16-3060-b
• [x] lemp10
• [x] oryp8

Requires: https://github.com/system76/coreboot/pull/223 Resolves: #525

[XV-02]

Looks like gaze16-3060-b passes the test.

[XV-02]

Looks like oryp8 correctly displays the splash screen and firmware setup.

[XV-02]

Gaze16-3050 looks like it shows splash and setup as desired.

[XV-02]

Gaze16-3060 also looks good.

[XV-02]

Lemp 10 is behaving.

[jacobgkau]

It's behaving fine on darp7.