Moved the memory allocator and its util functions out of the EIP712 subdirectory and gave it its own compilation flag

Also removed dead code

src_common/mem_utils.h

@@ -0,0 +1,16 @@
+#ifndef MEM_UTILS_H_
+#define MEM_UTILS_H_
+
+#ifdef HAVE_DYN_MEM_ALLOC
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define MEM_ALLOC_AND_ALIGN_TYPE(type)  mem_alloc_and_align(sizeof(type), __alignof__(type))
+
+char    *mem_alloc_and_format_uint(uint32_t value, uint8_t *const written_chars);
+void    *mem_alloc_and_align(size_t size, size_t alignment);
+
+#endif // HAVE_DYN_MEM_ALLOC
+
+#endif // MEM_UTILS_H_