Make uart_getenv() not be ns8250 dependent. This will allow, in the future,

compilation of kernels without ns8250 support but using the uart framework.
These kernels will be for machines where size matters more, so including code
that can never be executed is undesriable...

sys/dev/uart/uart_cpu_alpha.c

@@ -95,6 +95,7 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 	}
 
 	/* Check the environment. */
+	di->ops = uart_ns8250_ops;
 	if (uart_getenv(devtype, di) == 0)
 		return (0);
 

sys/dev/uart/uart_cpu_amd64.c

@@ -52,6 +52,7 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 	unsigned int i, ivar;
 
 	/* Check the environment. */
+	di->ops = uart_ns8250_ops;
 	if (uart_getenv(devtype, di) == 0)
 		return (0);
 

sys/dev/uart/uart_cpu_i386.c

@@ -52,6 +52,7 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 	unsigned int i, ivar;
 
 	/* Check the environment. */
+	di->ops = uart_ns8250_ops;
 	if (uart_getenv(devtype, di) == 0)
 		return (0);
 

sys/dev/uart/uart_cpu_ia64.c

@@ -104,5 +104,6 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 	}
 
 	/* Check the environment. */
+	di->ops = uart_ns8250_ops;
 	return (uart_getenv(devtype, di));
 }

sys/dev/uart/uart_cpu_pc98.c

@@ -52,6 +52,7 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 	unsigned int i, ivar, flags;
 
 	/* Check the environment. */
+	di->ops = uart_ns8250_ops;
 	if (uart_getenv(devtype, di) == 0)
 		return (0);
 

sys/dev/uart/uart_subr.c

@@ -182,7 +182,6 @@ uart_getenv(int devtype, struct uart_devinfo *di)
 		return (ENXIO);
 
 	/* Set defaults. */
-	di->ops = uart_ns8250_ops;
 	di->bas.chan = 0;
 	di->bas.regshft = 0;
 	di->bas.rclk = 0;