Add model of the Netduino Plus 2 board

Some allwinner-a10 code cleanup
New test cases for cubieboard
target/arm/arm-semi: fix SYS_OPEN to return nonzero filehandle
i.MX: add an emulation for RNGC device
target/arm: adjust program counter for wfi exception in AArch32
arm/gicv3: update virtual irq state after IAR register read
Set IL bit correctly for syndrome information for data aborts
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