drivers/interrupt_controller: Make VT-D remap generic and handle flags

This will not only be used by MSI remapping but by all relevant
interrupts.

Fix also IRTE settings:
- handle x2apic for destination id
- destination mode is always logical (as for IOAPIC)

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>