Ethdriver: Refactor to use new Driver framework

Use Camkes single threaded components and driver framework support for
Ethdriver component.

pc99: Allow user to configure promiscuous mode

Add promiscuous mode fields in Ethdriver 82580
and Ethdriver 82574

Ethdriver: Update plat code for new IRQ interface

This commit updates the platform specific code in Ethdriver to conform
to the new IRQ interface. The pc99 sources still use the old
'handle/acknowledge' functions as the IRQ information cannot be
determined statically during compile time.

Ethdriver: Move irq_acknowledge() to ethif_init()

The IRQ acknowledge function is now platform specific, so we move it to
platform specific code.

components: Add Ethdriver component

Moved the Ethdriver component from camkes-vm to this repository.