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>

platform/andes/ae350/platform.c

@@ -164,8 +164,6 @@ const struct sbi_platform_operations platform_ops = {
 	.final_init = ae350_final_init,
 
 	.console_init = ae350_console_init,
-	.console_putc = uart8250_putc,
-	.console_getc = uart8250_getc,
 
 	.irqchip_init = ae350_irqchip_init,