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Update update.md

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# 更新说明文档 ( Update Notes )
## 2021.12.22   // **v2.0 U6:  Kernel and firmware had upgraded.**
```
1. All systems kernel, firmware, bootloader, userland had upgraded to upstream
as "5.10.88-Release-OPENFANS+20211222-v8" Released now.
2.Media for v4l2-ctrls: Add V4L2_CID_NOTIFY_GAINS control.
3.Virtio_ring: Fix querying of maximum DMA mapping size for virtio device.
4.Add panel overlay for CutiePi.
5.DRM/VC4: hdmi: Support HDMI YUV output.
6.DRM/VC4: hdmi: Add full range RGB helper.
7.DRM/EDID: Rename drm_hdmi_avi_infoframe_colorspace to _colorimetry.
8.DRM/VC4: hdmi: Use full range helper in csc functions.
9.DRM/VC4: hdmi: Replace CSC_CTL hardcoded value by defines.
10.DRM/VC4: hdmi: Define colorspace matrices.
11.DRM/VC4: hdmi: Change CSC callback prototype.
12.DRM/VC4: hdmi: Take the sink maximum TMDS clock into account.
13.DRM/VC4: hdmi: Take bpp into account for the scrambler.
14.DRM/VC4: hdmi: Always try to have the highest bpc.
15.DRM/VC4: Skip writes to disabled packet RAM.
16.DRM/VC4: hdmi: Move clock validation to its own function.
```
## 2021.12.18   // **v2.0 U6:  Kernel and firmware had upgraded.**
```