[TGL] gamma not getting programmed using DSB but legacy MMIO_WRITE

In TGL, multi-segmented gamma is not getting programmed using DSB but using MMIO_WRITE(legacy manner) may be because of the recent changes done in DSB framework in

• commit 03cea61076f00ec6514aae88ec56f01117824cb7
• commit ac4eead3796579bdadd12e2fa99c4ddc920eda30

It needs further investigation. Found using local testing and not in CI.

https://patchwork.freedesktop.org/series/70129/

With the fix gamma is getting programmed using DSB. See the logs attached lucas_fix.txt

mentioned in issue #28

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