dev/uart: name uart_class_set DATA_SET macro UART_CLASS()

Use the macro "UART_CLASS()" for the newly created data set
'uart_class_set' as we do for other data sets.
This further hides the data set name.
Also add UART_CLASS for quicc, which was previously not done.

MFC after:	1 week
Improves:	949670f8f4 dev/uart: Use a linker set to find uart classes
Obtained from:	jhb, 269e99ac86
Reviewed by:	andrew
Differential Revision: https://reviews.freebsd.org/D43981

sys/dev/uart/uart_bus.h

@@ -70,6 +70,9 @@ struct uart_class {
 	u_int	uc_riowidth;		/* Default reg io width for this device. */
 };
 
+#define	UART_CLASS(class)						\
+    DATA_SET(uart_class_set, class)
+
 struct uart_softc {
 	KOBJ_FIELDS;
 	struct uart_class *sc_class;

sys/dev/uart/uart_dev_ns8250.c

@@ -451,7 +451,7 @@ struct uart_class uart_ns8250_class = {
 	.uc_rclk = DEFAULT_RCLK,
 	.uc_rshift = 0
 };
-DATA_SET(uart_class_set, uart_ns8250_class);
+UART_CLASS(uart_ns8250_class);
 
 /*
  * XXX -- refactor out ACPI and FDT ifdefs

sys/dev/uart/uart_dev_pl011.c

@@ -340,7 +340,7 @@ static struct uart_class uart_pl011_class = {
 	.uc_rclk = 0,
 	.uc_rshift = 2
 };
-DATA_SET(uart_class_set, uart_pl011_class);
+UART_CLASS(uart_pl011_class);
 
 #ifdef FDT
 static struct ofw_compat_data fdt_compat_data[] = {

sys/dev/uart/uart_dev_quicc.c

@@ -273,6 +273,7 @@ struct uart_class uart_quicc_class = {
 	.uc_rclk = DEFAULT_RCLK,
 	.uc_rshift = 0
 };
+UART_CLASS(uart_quicc_class);
 
 #define	SIGCHG(c, i, s, d)				\
 	if (c) {					\

sys/dev/uart/uart_dev_z8530.c

@@ -309,7 +309,7 @@ struct uart_class uart_z8530_class = {
 	.uc_rclk = DEFAULT_RCLK,
 	.uc_rshift = 0
 };
-DATA_SET(uart_class_set, uart_z8530_class);
+UART_CLASS(uart_z8530_class);
 
 #define	SIGCHG(c, i, s, d)				\
 	if (c) {					\