build: Fix several compile errors related to usage of const

* const is  added to a declaration in tpm2_attr_util.c and in
  tpm2_eventlog_yaml.c
* unnecessary const is removed in tools/tpm2_getekcertificate.c

Signed-off-by: Juergen Repp <juergen_repp@web.de>

Author: JuergenReppSIT

lib/tpm2_attr_util.c

@@ -381,7 +381,7 @@ static dispatch_table obj_attr_table[] = {         // Bit Index
         dispatch_reserved(31),                     // 31
 };
 
-static bool token_match(const char *name, const char *token, bool has_arg,
+static bool token_match(const char *name, char *token, bool has_arg,
         char **sep) {
 
     /* if it has an argument, we expect a separator */

lib/tpm2_eventlog_yaml.c

@@ -338,7 +338,7 @@ char **yaml_split_escape_string(UINT8 const *description, size_t size)
     size_t nlines = 0;
     size_t i, j, k;
     size_t len;
-    UINT8 *nl;
+    const UINT8 *nl;
 
     i = 0;
     do {

tools/tpm2_getekcertificate.c

@@ -1214,7 +1214,7 @@ static tool_rc process_output(void) {
      *  Base 64: https://tools.ietf.org/html/rfc4648#section-5 to PEM
      */
     if (ctx.web_cert_buffer && is_intel_cert && !ctx.is_cert_raw) {
-        char *split = strstr((const char *)ctx.web_cert_buffer, "certificate");
+        char *split = strstr((char *)ctx.web_cert_buffer, "certificate");
         char *copy_buffer = base64_decode(&split, ctx.web_cert_buffer_size);
         ctx.web_cert_buffer_size = strlen(PEM_BEGIN_CERT_LINE) +
             strlen(copy_buffer) + strlen(PEM_END_CERT_LINE);