Pull nios2 updates from Ley Foon Tan:
 "Most of updates are MMU related"

* tag 'nios2-v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2:
  nios2: Fix update_mmu_cache preload the TLB with the new PTE
  nios2: update_mmu_cache preload the TLB with the new PTE
  nios2: User address TLB flush break after finding the matching entry
  nios2: flush_tlb_all use TLBMISC way auto-increment feature
  nios2: improve readability of tlb functions
  nios2: flush_tlb_mm flush only the pid
  nios2: flush_tlb_pid can just restore TLBMISC once
  nios2: TLBMISC writes do not require PID bits to be set
  nios2: Use an invalid TLB entry address helper function
  nios2: pte_clear does not need to flush TLB
  nios2: flush_tlb_page use PID based flush
  nios2: update_mmu_cache clear the old entry from the TLB
  nios2: remove redundant 'default n' from Kconfig-s
  nios2: ksyms: Add missing symbol exports