Profiling on Espressif MCUs woes

[Bryght-Richard]

I found Espressif's gprof. Changing the default is easy, but combining multiple text sections is more complicated, but should be doable by merging the symbol sets using BFD.

[Bryght-Richard]

Cleaned up patches for upstream OpenOCD available here, could use reviewers and testers for ESP32 and ESP32-S2.