Change in coreboot[master]: soc/mediatek: dsi: fine tune the delta time for EoTp

[Shaoming Chen (Code Review)]

Attention is currently required from: Chen-Tsung Hsieh, jitao shi, Jitao Shi, Yu-Ping Wu.
Shaoming Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51432 )

Change subject: soc/mediatek: dsi: fine tune the delta time for EoTp
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Patch Set 5:

(2 comments)

File src/soc/mediatek/common/dsi.c:

https://review.coreboot.org/c/coreboot/+/51432/comment/6bf57fa0_15cc7fe0 
PS2, Line 207: 10
> Your implementation in patchset_5 is not align with b/173603645#comment63. […]

The effect is the same with MIPI_DSI_MODE_EOT_PACKET, 12 byte also.

File src/soc/mediatek/common/dsi.c:

https://review.coreboot.org/c/coreboot/+/51432/comment/5cb276f2_0ed6b06e 
PS5, Line 213: 6
> Do we need to modify it?

It's same with before, delta += 6