Merge remote-tracking branch 'remotes/alistair23/tags/pull-riscv-to-apply-20210921' into staging

Second RISC-V PR for QEMU 6.2

 - ePMP CSR address updates
 - Convert internal interrupts to use QEMU GPIO lines
 - SiFive PWM support
 - Support for RISC-V ACLINT
 - SiFive PDMA fixes
 - Update to u-boot instructions for sifive_u
 - mstatus.SD bug fix for hypervisor extensions
 - OpenTitan fix for USB dev address

# gpg: Signature made Mon 20 Sep 2021 11:52:26 PM PDT
# gpg:                using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: F6C4 AC46 D493 4868 D3B8  CE8F 21E1 0D29 DF97 7054

* remotes/alistair23/tags/pull-riscv-to-apply-20210921: (21 commits)
  hw/riscv: opentitan: Correct the USB Dev address
  target/riscv: csr: Rename HCOUNTEREN_CY and friends
  target/riscv: Backup/restore mstatus.SD bit when virtual register swapped
  docs/system/riscv: sifive_u: Update U-Boot instructions
  hw/dma: sifive_pdma: don't set Control.error if 0 bytes to transfer
  hw/dma: sifive_pdma: allow non-multiple transaction size transactions
  hw/dma: sifive_pdma: claim bit must be set before DMA transactions
  hw/dma: sifive_pdma: reset Next* registers when Control.claim is set
  hw/riscv: virt: Add optional ACLINT support to virt machine
  hw/riscv: virt: Re-factor FDT generation
  hw/intc: Upgrade the SiFive CLINT implementation to RISC-V ACLINT
  hw/intc: Rename sifive_clint sources to riscv_aclint sources
  sifive_u: Connect the SiFive PWM device
  hw/timer: Add SiFive PWM support
  hw/intc: ibex_timer: Convert the timer to use RISC-V CPU GPIO lines
  hw/intc: sifive_plic: Convert the PLIC to use RISC-V CPU GPIO lines
  hw/intc: ibex_plic: Convert the PLIC to use RISC-V CPU GPIO lines
  hw/intc: sifive_clint: Use RISC-V CPU GPIO lines
  target/riscv: Expose interrupt pending bits as GPIO lines
  target/riscv: Fix satp write
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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