### Description <!-- Required Add detailed description of what you are reporting. Good example: https://os.mbed.com/docs/latest/reference/workflow.html Things to consider sharing: - What target does this relate to? - What toolchain (name + version) are you using? - What tools (name + version - is it mbed-cli, online compiler or IDE) are you using? - What is the SHA of Mbed OS (git log -n1 --oneline)? - Steps to reproduce. (Did you publish code or a test case that exhibits the problem?) --> ### Issue request type <!-- Required Please add only one X to one of the following types. Do not fill multiple types (split the issue otherwise.) Please note this is not a GitHub task list, indenting the boxes or changing the format to add a '.' or '*' in front of them would change the meaning incorrectly. The only changes to be made are to add a description text under the description heading and to add a 'x' to the correct box. --> [ ] Question [ ] Enhancement [x] Bug The value for [`MBEDTLS_ERR_PLATFORM_HW_FAILED`](https://github.com/ARMmbed/mbed-os/blob/master/features/mbedtls/platform/inc/platform_mbed.h#L28) is wrong, as it should be an Mbed TLS low level error, and the limit for this type of error is 0x007f.