Added K64F TCP/IP support

Currently NET_7 (HttpClient test) and NET_8 (NTP test) fail for
unknown reasons.
K64F TCP/IP code compilation temporary workaround
Updated MBED_A19 24LC256 EEPROM test. Added new test MBED_A25 24LC256 I2C EEPROM pattern write/read to test suite
Small updates for test MBED_A12, MBED_A19, MBED_A25 (SD, EEPROM, EEPROM)
[NUCLEO_F302R8] Add LSE configuration for RTC
Merge pull request #274 from bcostm/master

[NUCLEO_F302R8] Add LSE configuration for RTC