drivers/char: Check if console=dtuart for ACPI SPCR serial bring up

dtuart denotes a generic UART parsed from a device tree (back then it
was the only method, hence dt prefix) or ACPI SPCR table (they all use
the SERHND_DTUART serial handle). Currently we only check if console= is
set to dtuart in the DT flow and not in the ACPI flow. This means that
even if we set console=none we would still bring up ACPI parsed
serial device for nothing. Move the check to uart_init() to cover both
paths.

Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/drivers/char/uart-init.c

@@ -38,9 +38,6 @@ static void __init dt_uart_init(void)
     const char *options;
     char *split;
 
-    if ( !console_has("dtuart") )
-        return; /* Not for us */
-
     if ( !strcmp(opt_dtuart, "") )
     {
         const struct dt_device_node *chosen = dt_find_node_by_path("/chosen");
@@ -121,6 +118,9 @@ static void __init acpi_uart_init(void) { }
 
 void __init uart_init(void)
 {
+    if ( !console_has("dtuart") )
+        return; /* Not for us */
+
     if ( acpi_disabled )
         dt_uart_init();
     else