hw/pci-host: Use CONFIG_PCI_BONITO to select the Bonito North Bridge

Ease the kconfig selection by introducing CONFIG_PCI_BONITO to select
the Bonito North Bridge.

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: <20200510210128.18343-6-f4bug@amsat.org>
Reviewed-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
diff --git a/hw/mips/Kconfig b/hw/mips/Kconfig
index 2c2adbc..2240504 100644
--- a/hw/mips/Kconfig
+++ b/hw/mips/Kconfig
@@ -43,6 +43,7 @@
 
 config FULONG
     bool
+    select PCI_BONITO
 
 config MIPS_CPS
     bool