Add hifive_unleashed//u54
and hifive_unmatched//u74
targets
#73791
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This PR adds support for the following two new targets on boards with SiFive Freedom SoC series chips:
hifive_unleashed//u54
hifive_unmatched//u74
The old
hifive_unleashed
andhifive_unmatched
are available with the following names, respectively:hifive_unleashed//e51
hifive_unmatched//s7
For HiFive Unmatched-based targets, this PR also switches the port to target the L2$ memory instead of DDR, since DDR is not initialized after cold boot, making uploading (and running) Zephyr impossible.