Change in flashrom[master]: tests: Do not build a test if its driver is not built

[Nico Huber (Code Review)]

Attention is currently required from: Edward O'Callaghan, Angel Pons, Anastasia Klimchuk.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/55295 )

Change subject: tests: Do not build a test if its driver is not built
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Patch Set 2:

(1 comment)

File tests/init_shutdown.c:

https://review.coreboot.org/c/flashrom/+/55295/comment/e006ddeb_4f66cc6c 
PS1, Line 35: #if CONFIG_DUMMY == 1
            : void dummy_init_and_shutdown_test_success(void **state)
            : {
            : 	run_lifecycle(state, PROGRAMMER_DUMMY, "bus=parallel+lpc+fwh+spi");
            : }
            : #endif /* CONFIG_DUMMY */
> I was going to wait for Thomas' patch series to be submitted first. […]

Right, this would actually benefit from removing the #if's from `programmer.h`.
In theory this might work then:

if (CONFIG_DUMMY)
            run_lifecycle(state, programmer_dummy, "bus=parallel+lpc+fwh+spi");

Probably needs a linker flag, IIRC `--gc-sections`. The idea is that the code
would get garbage collected in case `CONFIG_DUMMY == 0` and then the linker
wouldn't have to complain about the missing `programmer_dummy`.