1. Removed DHE ciphers when mbedTLS is disabled since they take
too much processing power.
2. Removed support of SHA384 and SHA512 when mbedTLS is disabled
due to too much processing needed.
3. Fixed bugs in crypto_hash_init API which was causing
EAP connections to fail when mbedTLS was enabled.
4. Cleaned some code of crypto_hash_***
Move supplicant to idf and do following refactoring:
1. Make the folder structure consitent with supplicant upstream
2. Remove duplicated header files and minimize the public header files
3. Refactor for WiFi/supplicant interfaces