lib: sbi: Simplify console platform operations

Instead of having console_putc() and console_getc() callbacks in
platform operations, it will be much simpler for console driver to
directly register these operations as device to the sbi_console
implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Xiang W <wxjstz@126.com>

lib/utils/serial/fdt_serial_uart8250.c

@@ -34,6 +34,4 @@ static const struct fdt_match serial_uart8250_match[] = {
 struct fdt_serial fdt_serial_uart8250 = {
 	.match_table = serial_uart8250_match,
 	.init = serial_uart8250_init,
-	.getc = uart8250_getc,
-	.putc = uart8250_putc
 };