riscv: Move strcmp to util

include/util.h

@@ -89,6 +89,7 @@ void memzero(void *s, unsigned long n);
 void *memset(void *s, unsigned long c, unsigned long n) VISIBLE;
 void *memcpy(void* ptr_dst, const void* ptr_src, unsigned long n) VISIBLE;
 int PURE strncmp(const char *s1, const char *s2, int n);
+int strcmp(const char *s1, const char *s2);
 unsigned long strlen(const char *s);
 long CONST char_to_long(char c);
 long PURE str_to_long(const char* str);