lib: utils/serial: Support multiple UART8250 devices

Previously we assume only 1 UART8250 instance can be used. Now we support
multiple instances by introducing counterpart functions to putc/getc/init
which take an extra *dev parameter, and name them as uart8250_device_xyz()
The original functions without the *dev parameter will operate on the
default instance exactly the same as before, so no changes on the caller
is required.

Note: uart8250_device_init only does device initialization without the
console registration logic.

Signed-off-by: Bo Gan <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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