hashes:sha3: Remove unused functions from Keccak code

Remove unused SHAKE functions
Removed unused SHA3-224

sys/hashes/sha3.c

@@ -88,31 +88,6 @@ static void Keccak(unsigned int rate, unsigned int capacity, const unsigned char
                    unsigned long long int inputByteLen, unsigned char delimitedSuffix, unsigned char *output,
                    unsigned long long int outputByteLen);
 
-/**
- *  Function to compute SHAKE128 on the input message with any output length.
- */
-void FIPS202_SHAKE128(const unsigned char *input, unsigned int inputByteLen, unsigned char *output, int outputByteLen)
-{
-    Keccak(1344, 256, input, inputByteLen, 0x1F, output, outputByteLen);
-}
-
-/**
- *  Function to compute SHAKE256 on the input message with any output length.
- */
-void FIPS202_SHAKE256(const unsigned char *input, unsigned int inputByteLen, unsigned char *output, int outputByteLen)
-{
-    Keccak(1088, 512, input, inputByteLen, 0x1F, output, outputByteLen);
-}
-
-/**
- *  Function to compute SHA3-224 on the input message. The output length is fixed to 28 bytes.
- */
-void FIPS202_SHA3_224(const unsigned char *input, unsigned int inputByteLen, unsigned char *output)
-{
-    Keccak(1152, 448, input, inputByteLen, 0x06, output, 28);
-}
-
-
 /**
  *  Function to compute SHA3-256 on the input message. The output length is fixed to 32 bytes.
  */