Update I2CSlave.cpp

Removed comments again regarding need for dedicated i2c_slave_byte_read() and i2c_slave_byte_read(). This issue is captured in "I2c - slave should have own write/read functions (#896)"

Author: Willem23

libraries/mbed/common/I2CSlave.cpp

@@ -43,10 +43,6 @@ int I2CSlave::read(char *data, int length) {
 }
 
 int I2CSlave::read(void) {
-// The dedicated I2C Slave byte read and byte write functions need to be called
-// from 'common' mbed I2CSlave API for devices that have separate Master and 
-// Slave engines such as the lpc812 and lpc1549.
-//    return i2c_slave_byte_read(&_i2c, 0);
     return i2c_byte_read(&_i2c, 0);
 }
 
@@ -55,11 +51,6 @@ int I2CSlave::write(const char *data, int length) {
 }
 
 int I2CSlave::write(int data) {
-// The dedicated I2C Slave byte read and byte write functions need to be called
-// from 'common' mbed I2CSlave API for devices that have separate Master and 
-// Slave engines such as the lpc812 and lpc1549.
-//
-//   return i2c_slave_byte_write(&_i2c, data);    
     return i2c_byte_write(&_i2c, data);
 }