STM32F303xC: correct RAM size

[jeromecoutant]

Summary of changes

Fix #15377

wrong info in keil pack
=> wrong info in ARM pack manager IRAM1 mbed section
=> wrong info in cmsis_nvic.h file

This PR corrects the mbed-os part :-)

@JojoS62

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

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[JojoS62]

thanks for your quick fix.
The remainig 8 kB can be used by defining a section in the linker script. I'm currently testing this and can send the modification.

[JojoS62]

this is my modified linker file, it adds a RAM_CCM section.
https://github.com/mbed-ce/mbed-os/blob/fix-F303-ramsize/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xC/TOOLCHAIN_GCC_ARM/STM32F303XC.ld

I have it only for gcc_arm.

are the cmsis_nvic.h files generated from the arm pack files by a script ?

[mbed-ci]

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jobs	Status
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️