R7800 thermal sensors... which physical part of the hardware these correspond to?

It is still a bit unclear, as the chipset manufactureer has not provided detailed descriptions.

I think that the 17.01 branch may have only four sensors available, but master has 11 since this commit in early 2017:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=dc32d0a53cc01d9f644c6e9851b6770440d4b28c

"tsens driver"
https://git.lede-project.org/?p=source.git;a=history;f=target/linux/ipq806x/files-4.9/arch/arm/boot/dts/qcom-ipq8064.dtsi;h=9996bd74151a3db1d9516a178e07e6470b134373;hb=HEAD

The earlier implementation, still there in 17.01:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=fef6a96d9e9e001a28b6a673c56ed79029457b5d

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