[dev][uart][pl011] switch configuration to a structure

This should be a bit easier to deal with going forward.

platform/qemu-virt-arm/platform.c

@@ -66,7 +66,13 @@ void platform_early_init(void) {
 
     arm_generic_timer_init(ARM_GENERIC_TIMER_PHYSICAL_INT, 0);
 
-    pl011_init_early(0, UART_BASE, UART0_INT, PL011_FLAG_DEBUG_UART);
+    struct pl011_config uart_config = {
+        .base = UART_BASE,
+        .irq = UART0_INT,
+        .flag = PL011_FLAG_DEBUG_UART,
+    };
+
+    pl011_init_early(0, &uart_config);
 
     if (LOCAL_TRACE) {
         LTRACEF("dumping FDT at %p\n", fdt);