arm: drop unused irq-related part of CPUARMState

These two fields were added as a part of ARMv7 support patch (back in
2007), were never used by any code, so can be dropped.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>

target-arm/cpu.h

@@ -157,10 +157,6 @@ typedef struct CPUARMState {
     /* Internal CPU feature flags.  */
     uint32_t features;
 
-    /* Callback for vectored interrupt controller.  */
-    int (*get_irq_vector)(struct CPUARMState *);
-    void *irq_opaque;
-
     /* VFP coprocessor state.  */
     struct {
         float64 regs[32];