dts-lib: rework flashing method

[filipleple]

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Affected component(s) or functionality (if applicable)

flashing keywords in dts-lib

Brief summary

In lib/dts-lib.robot, there is a keyword called Flash Firmware In DTS for flashing that forces flashing with the internal programmer. It needs to be replaced with the more generic keyword that we already have developed in keys-and-keywords/flashrom.robot.

Additional context

[macpijan]

@BeataZdunczyk Should be rather easy task. The kwd from dts-lib should be replaced from the one in lib/flash.robot for internal flashing.

We need to locate which test uses this keyword, so we can prove the replacing was successufl.

[wiktormowinski]

done with the switcheroo: #404

Tests affected by the change:
ECR022.001 - we always skip that one
ECR023.001 - as above
DTS005.001 - qemu skips it, am i doing something wrong or is this one also redundant??

[macpijan]

QEMU does not support flashrom yet, for sure.

It may be true that this particular test case is mostly not used right now.