FIX: Several build issues following configuration changes

[blckmn]

1. RX_SPI pins undefined
2. SDCARD enabled but no utilisation (i.e. no blackbox selected).
3. Camera Control Pin - Improved readability (readiness for "black" macro magic)

[github-actions]

Do you want to test this code? Here you have an automated build:
Assets
WARNING: It may be unstable. Use only for testing! See: https://www.youtube.com/watch?v=I1uN9CN30gw for instructions for unified targets!

[blckmn]

AUTOMERGE: (FAIL)

• github identifies PR as mergeable -> FAIL
• assigned to a milestone -> PASS
• cooling off period lapsed -> PASS
• commit count less or equal to three -> PASS
• Don't merge label NOT found -> PASS
• at least one RN: label found -> PASS
• Tested label found -> FAIL
• assigned to an approver -> PASS
• approver count at least three -> FAIL

[hydra]

Since the conversation regarding adding CI_TARGETS is marked as resolved before I saw it which means others probably won't see it either, I'm re-posting my comment here:

Can we also please add to the list:

1. SPRacingH7EXTREME to that list because it's an the only EXST H750 target that uses quad SPI and there are no other targets that check a) the EXST build system for H750 and b) that compile QuadSPI.

2. SPRacingH7RF as it's the only EXST H730 target that uses octospi and memory mapped code as there are no other targets that check a) the EXST build system for H730 and b) that compile the OctoSPI and CONFIG_IN_MEMORY_MAPPED_FLASH code

Currently there is no CI visibility on any of the above and build or compilation issues are likely to creep in un-noticed

[hydra]

have the corresponding targets that were relying on this been also updated to include the appropriate #define in the unified targets repo and in the src/configs folder.