Bump nemu ref in ready-to-run

* NEMU commit: 164dd64f0117f3107bbb1add04d9c564e2261bfa
* NEMU configs:
  * riscv64-xs-ref_defconfig
  * riscv64-dual-xs-ref_defconfig

Including:
  * feat(force_raise_pf): dut can guide the REF's {x}tval
  * fix(imsic): fix priv check when access imsic
  * fix(csr): add support non register interrupt pending and refactor xip/xie csr read/write

Author: Anzooooo