ima: rename FILE_MMAP to MMAP_CHECK

Rename FILE_MMAP hook to MMAP_CHECK to be consistent with the other
hook names.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>

security/integrity/ima/ima_main.c

@@ -228,7 +228,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
 {
 	if (file && (prot & PROT_EXEC))
 		return process_measurement(file, file->f_dentry->d_name.name,
-					   MAY_EXEC, FILE_MMAP);
+					   MAY_EXEC, MMAP_CHECK);
 	return 0;
 }