Merge remote-tracking branch 'pmaydell/arm-devs.for-upstream' into staging

* pmaydell/arm-devs.for-upstream:
  exynos4210: add Exynos4210 i2c implementation
  hw/exynos4210_rtc.c: remove unnecessary code
  hw/exynos4210_rtc.c: Fix calculating for value of year
  hw/vexpress.c: Allow >4GB of RAM for Cortex-A15 daughterboard
  hw/arm_boot.c: Support DTBs which use 64 bit addresses
  device_tree: Add support for reading device tree properties
  hw/arm_boot.c: Check for RAM sizes exceeding ATAGS capacity
  hw/arm_boot.c: Consistently use ram_size from arm_boot_info struct
  hw/arm_boot.c: Make ram_size a uint64_t
  hw/pl011.c: Avoid crash on read when no chr backend present