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aarch64: implement new Interrupt Controller abstractions (#972)
* Implements the basic set of two interrupt controller abstractions for aarch64: 1. `LocalInterruptController`: an interrupt controller local to each CPU. 2. `SystemWideInterruptController`: the system-wide interrupt controller that is responsible for redirecting interrupts to local CPUs. * These are not yet used, since they haven't been implemented for x86_64. * Make `BOARD_CONFIG` const so that it can be used in other const contexts. * Add board-specific fixed interrupt numbers to `BOARD_CONFIG`. * Temporarily remove the aarch64-specific distinction between various types of interrupt numbers, e.g., local, IPI, shared peripheral, etc. * `InterruptDestination` correspondingly no longer uses a local number. * Once we determine an appropriate abstraction for this that is also compatible with x86, we will restore the `InterruptNumber` type with its constructor-checked correctness conditions. * Device specific: for the PL011 UART device, we no longer enable timer interrupts in `interrupts::init()` because they are better off enabled later. * Remove the `get_int_ctlr` macro in favor of regular accessor code. This will be updated again once we redesign the interrupt controller structs to contain actual owned MMIO objects that offer access to the interrupt chip device. 5c351a2
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‎doc/arm_boards/index.html‎

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<div><table><thead><tr><th>Board Name</th><th>Num CPUs</th><th>Interrupt Controller</th><th>Secondary CPU Startup Method</th></tr></thead><tbody>
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<tr><td>qemu_virt</td><td>4</td><td>GICv3</td><td>PSCI</td></tr>
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</tbody></table>

‎doc/captain/fn.init.html‎

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kernel_mmi_ref: MmiRef,
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bsp_initial_stack: NoDrop&lt;Stack&gt;,
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drop_after_init: <a class="struct" href="struct.DropAfterInit.html" title="struct captain::DropAfterInit">DropAfterInit</a>,

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