ADC: STM32H7: Skip Negative input analog channels (INN)

[AnishKumarHCL]

Summary of changes

mbed-os does not support ADC INN channels. So removed INN channels from
STM32H7 PeripheralPins.c files and updated STM32_gen_PeripheralPins.py
script to skip INN adc channels.

Impact of changes

Migration actions required

Documentation

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

@jeromecoutant

[ciarmcom]

@AnishKumarHCL, thank you for your changes.
@jeromecoutant @ARMmbed/mbed-os-maintainers please review.

[jeromecoutant]

Minor request about python script:

• could you update GENPINMAP_VERSION = "1.20.1" to 1.20.2 ?
• why did you change chmod ?

[jeromecoutant]

FYI: @pennam

[0xc0170]

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