[Pal/lib] Remove lingering mentions of WolfSSL

Graphene moved to mbedTLS due to licensing issues, and all WolfSSL files
were deleted from the repo long time ago.

Pal/lib/Makefile

@@ -22,7 +22,6 @@ endif
 
 subdirs = string stdlib network graphene crypto
 
-# Choose Crypto provider among (mbedtls|wolfssl)
 CRYPTO_PROVIDER ?= mbedtls
 
 # Select which crypto adpater you want to use here. This has to match
@@ -37,10 +36,6 @@ ifeq ($(CRYPTO_PROVIDER),mbedtls)
 subdirs += crypto/mbedtls
 crypto_mbedtls_objs = $(addsuffix .o,aes aesni asn1parse base64 bignum cipher cipher_wrap cmac dhm md md_wrap oid rsa sha256)
 endif
-ifeq ($(CRYPTO_PROVIDER),wolfssl)
-subdirs += crypto/wolfssl
-crypto_wolfssl_objs = $(addsuffix .o,$(patsubst %.c,%.o,$(sort $(wildcard crypto/wolfssl/*.c))))
-endif
 
 string_objs = $(addsuffix .o,atoi memcmp memcpy memset strchr strendswith strlen wordcopy)
 stdlib_objs = $(addsuffix .o,printfmt)
@@ -55,11 +50,6 @@ objs += crypto/adapters/mbedtls_adapter.o
 objs += crypto/adapters/mbedtls_dh.o
 objs += crypto/adapters/mbedtls_encoding.o
 endif
-ifeq ($(CRYPTO_PROVIDER),wolfssl)
-CFLAGS += -DCRYPTO_USE_WOLFSSL
-objs += crypto/adapters/wolfssl_adapter.o
-objs += crypto/adapters/wolfssl_dh.o
-endif
 
 .PHONY: all
 all: $(target)graphene-lib.a

Pal/lib/pal_crypto.h

@@ -30,28 +30,6 @@
 
 #define SHA256_DIGEST_LEN 32
 
-#ifdef CRYPTO_USE_WOLFSSL
-#define CRYPTO_PROVIDER_SPECIFIED
-
-#include "crypto/wolfssl/cmac.h"
-#include "crypto/wolfssl/aes.h"
-#include "crypto/wolfssl/sha256.h"
-#include "crypto/wolfssl/dh.h"
-#include "crypto/wolfssl/rsa.h"
-
-typedef SHA256 LIB_SHA256_CONTEXT;
-
-#define DH_SIZE 128
-
-typedef struct {
-    uint8_t priv[DH_SIZE];
-    uint32_t priv_size;
-    DhKey key;
-} LIB_DH_CONTEXT __attribute__((aligned(DH_SIZE)));
-
-typedef struct RSAKey LIB_RSA_KEY;
-#endif /* CRYPTO_USE_WOLFSSL */
-
 #ifdef CRYPTO_USE_MBEDTLS
 #define CRYPTO_PROVIDER_SPECIFIED