dm: x86: queensbay: Add an interrupt driver

Add a driver for interrupts on queensbay and move the code currently in
cpu_irq_init() into its probe() method.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/queensbay/Makefile b/arch/x86/cpu/queensbay/Makefile
index 660f967..af3ffad 100644
--- a/arch/x86/cpu/queensbay/Makefile
+++ b/arch/x86/cpu/queensbay/Makefile
@@ -4,5 +4,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += fsp_configs.o
+obj-y += fsp_configs.o irq.o
 obj-y += tnc.o topcliff.o