Merge tag 'kvm-riscv-fixes-6.0-1' of https://github.com/kvm-riscv/linux into HEAD

Merge tag 'kvm-riscv-fixes-6.0-1' of https://github.com/kvm-riscv/linux into HEAD

KVM/riscv fixes for 6.0, take #1

- Fix unused variable warnings in vcpu_timer.c
- Move extern sbi_ext declarations to a header