target-arm queue:

 * v7M: various code cleanups
 * v7M: set correct BFSR bits on bus fault
 * v7M: clear exclusive monitor on reset and exception entry/exit
 * v7M: don't apply priority mask to negative priorities
 * zcu102: support 'secure' and 'virtualization' machine properties
 * aarch64: fix ERET single stepping
 * gpex: implement PCI INTx routing
 * mps2-an511: fix UART overflow interrupt line wiring
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