Merge remote-tracking branch 'remotes/rth/tags/pull-pa-20200127' into staging

Improve LASI emulation
Add Artist graphics
Fix main memory allocation
Improve LDCW emulation wrt real hw

# gpg: Signature made Mon 27 Jan 2020 18:53:35 GMT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-pa-20200127:
  target/hppa: Allow, but diagnose, LDCW aligned only mod 4
  hw/hppa/machine: Map the PDC memory region with higher priority
  hw/hppa/machine: Restrict the total memory size to 3GB
  hw/hppa/machine: Correctly check the firmware is in PDC range
  hppa: Add emulation of Artist graphics
  seabios-hppa: update to latest version
  hppa: Switch to tulip NIC by default
  hppa: add emulation of LASI PS2 controllers
  ps2: accept 'Set Key Make and Break' commands
  hppa: Add support for LASI chip with i82596 NIC
  hw/hppa/dino.c: Improve emulation of Dino PCI chip

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