Merge remote-tracking branch 'remotes/palmer/tags/riscv-for-master-4.2-sf2' into staging

RISC-V Patches for the 4.2 Soft Freeze, Part 2

This patch set contains a handful of small fixes for RISC-V targets that
I'd like to target for the 4.2 soft freeze.  They include:

* A fix to allow the debugger to access the state of all privilege
  modes, as opposed to just the currently executing one.
* A pair of cleanups to implement cpu_do_transaction_failed.
* Fixes to the device tree.
* The addition of various memory regions to make the sifive_u machine
  more closely match the HiFive Unleashed board.
* Fixes to our GDB interface to allow CSRs to be accessed.
* A fix to a memory leak pointed out by coverity.
* A fix that prevents PMP checks from firing incorrectly.

This passes "make chcek" and boots Open Embedded for me.

# gpg: Signature made Mon 28 Oct 2019 15:47:52 GMT
# gpg:                using RSA key 00CE76D1834960DFCE886DF8EF4CA1502CCBAB41
# gpg:                issuer "palmer@dabbelt.com"
# gpg: Good signature from "Palmer Dabbelt <palmer@dabbelt.com>" [unknown]
# gpg:                 aka "Palmer Dabbelt <palmer@sifive.com>" [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: 00CE 76D1 8349 60DF CE88  6DF8 EF4C A150 2CCB AB41

* remotes/palmer/tags/riscv-for-master-4.2-sf2:
  target/riscv: PMP violation due to wrong size parameter
  riscv/boot: Fix possible memory leak
  target/riscv: Make the priv register writable by GDB
  target/riscv: Expose "priv" register for GDB for reads
  target/riscv: Tell gdbstub the correct number of CSRs
  riscv/virt: Jump to pflash if specified
  riscv/virt: Add the PFlash CFI01 device
  riscv/virt: Manually define the machine
  riscv/sifive_u: Add the start-in-flash property
  riscv/sifive_u: Manually define the machine
  riscv/sifive_u: Add QSPI memory region
  riscv/sifive_u: Add L2-LIM cache memory
  linux-user/riscv: Propagate fault address
  riscv: sifive_u: Add ethernet0 to the aliases node
  riscv: hw: Drop "clock-frequency" property of cpu nodes
  RISC-V: Implement cpu_do_transaction_failed
  RISC-V: Handle bus errors in the page table walker
  riscv: Skip checking CSR privilege level in debugger mode

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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