delete extra line

src/register/pmpcfgx.rs

@@ -170,4 +170,4 @@ pub mod pmpcfg2 {
 pub mod pmpcfg3 {
     read_csr_as_usize_rv32!(0x3A3, __read_pmpcfg3);
     write_csr_as_usize_rv32!(0x3A3, __write_pmpcfg3);
-}
+}