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_sifive.c

@@ -32,7 +32,5 @@ static const struct fdt_match serial_sifive_match[] = {
 
 struct fdt_serial fdt_serial_sifive = {
 	.match_table = serial_sifive_match,
-	.init = serial_sifive_init,
-	.getc = sifive_uart_getc,
-	.putc = sifive_uart_putc
+	.init = serial_sifive_init
 };