[uart] Add support for MMIO-accessible 16550 UARTs

[uart] Add support for MMIO-accessible 16550 UARTs

16550 UARTs exist on non-x86 platforms but will be accessible via MMIO
rather than port I/O.  It is possible to encounter MMIO-mapped 16550
UARTs on x86 platforms, but there is no real requirement to support
them in iPXE since the standard COM1, COM2, etc ports have been
present on every PC-compatible machine since 1981.

Assume for now that accessing 16550 UART registers requires
inb()/outb() on x86 and readb()/writeb() on other architectures.

Allow for the existence of a register shift on MMIO-mapped 16550
UARTs, since modern SoCs tend to treat register addresses as being
aligned to either 32-bit or 64-bit boundaries.

Signed-off-by: Michael Brown <mcb30@ipxe.org>