Xen: Select correct dom0 console

If Xen is enabled, tell Dom0 to use the 'hvc0' console, and fall back to
the usual ttyAMA0 otherwise.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
diff --git a/configure.ac b/configure.ac
index 9259f80..8190b03 100644
--- a/configure.ac
+++ b/configure.ac
@@ -73,7 +73,8 @@
 AC_SUBST([FILESYSTEM], [$USE_INITRD])
 AM_CONDITIONAL([INITRD], [test "x$USE_INITRD" != "x"])
 
-C_CMDLINE="console=ttyAMA0 earlyprintk=pl011,0x1c090000"
+AS_IF([test "x$X_IMAGE" = "x"],[C_CONSOLE="ttyAMA0"],[C_CONSOLE="hvc0"])
+C_CMDLINE="console=$C_CONSOLE earlyprintk=pl011,0x1c090000"
 AC_ARG_WITH([cmdline],
 	AS_HELP_STRING([--with-cmdline], [set a command line for the kernel]),
 	[C_CMDLINE=$withval])