dm: serial: Add clock member to struct serial_device_info

Some callers of serial_getinfo() would like to know the UART base
clock speed in order to make decision what to pass to OS in some
cases. In particular, ACPI SPCR table expects only certain base
clock speed and thus we have to act accordingly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/test/dm/serial.c b/test/dm/serial.c
index 3d741a8..c6be6ab 100644
--- a/test/dm/serial.c
+++ b/test/dm/serial.c
@@ -29,6 +29,7 @@
 	ut_assertok(serial_getinfo(dev_serial, &info_serial));
 	ut_assert(info_serial.type == SERIAL_CHIP_UNKNOWN);
 	ut_assert(info_serial.addr == SERIAL_DEFAULT_ADDRESS);
+	ut_assert(info_serial.clock == SERIAL_DEFAULT_CLOCK);
 	/*
 	 * test with a parameter which is NULL pointer
 	 */