[GStreamer][WesterosQuirk] set low-latency-mode property

[goruklu]

Amlogic uses "low-latency-mode" Westeros sink property instead of "immediate-mode" for lowest latency.
bfbdaec

Build-Tests	Layout-Tests
✅ 🛠 wpe-246-amd64-build	✅ 🧪 wpe-246-amd64-layout
✅ 🛠 wpe-246-arm32-build	❌ 🧪 wpe-246-arm32-layout

[goruklu]

We will try to re-use the immediate-mode property for Amlogic Westeros-sink as well.
Westeros sink will have to handle different codecs properly.

[eocanha]

(Copying comment from #1628 (comment) here)

Regarding the immediate-output property (I'm assuming you're talking about that one), I'd like to comment that it's currently causing issues on live game streaming for some online services. This is not directly related to this PR, but I still think it's worth to mention.

Have a look at #1572 (comment)

[eocanha]

We will try to re-use the immediate-mode property for Amlogic Westeros-sink as well. Westeros sink will have to handle different codecs properly.

As per this comment, I'm assumint that this Draft PR, as well as #1628, is no longer needed. Please, feel free to reopen it if you still want to use different property names.