List of changes:
- modified Autotools, CMake and Android build systems
- increased heap size as new version requires additional 64B
- replaced deprecated API (mbedtls_ecdsa_sign_det)
- removed workaround with defining mbedtls_ecp_restart_ctx
This commit adds `update-makefiles.py` script which helps update
different make/build files supported by OpenThread project including
`CMakeList.txt`, `BUILD.gn`, `Android.mk`, `Andriod.bp`, and
`Makefile.am` based on the source (`cpp`, `hpp`, and `h`) files in
`./src/core` and `./include/openthread` folders. This script is
intended to make it easier for developer when adding/removing/renaming
source files within OT core to help update all the make/build files.
This commit also updates `Makefile.am` ensuring the list are sorted
alphabetically (this is generated by running the script).
