hw/core: Add a config switch for the "split-irq" device

The "split-irq" device is currently only used by machines that use
CONFIG_ARMSSE. Let's add a proper CONFIG_SPLIT_IRQ switch for this
so that it only gets compiled when we really need it.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190817101931.28386-7-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/arm/Kconfig

@@ -81,6 +81,7 @@ config MUSCA
     select ARMSSE
     select PL011
     select PL031
+    select SPLIT_IRQ
 
 config MUSICPAL
     bool
@@ -364,6 +365,7 @@ config MPS2
     select OR_IRQ
     select PL022    # Serial port
     select PL080    # DMA controller
+    select SPLIT_IRQ
 
 config FSL_IMX7
     bool
@@ -442,6 +444,7 @@ config ARMSSE
     select IOTKIT_SYSCTL
     select IOTKIT_SYSINFO
     select OR_IRQ
+    select SPLIT_IRQ
     select TZ_MPC
     select TZ_MSC
     select TZ_PPC

hw/core/Kconfig

@@ -15,3 +15,6 @@ config PLATFORM_BUS
 
 config REGISTER
     bool
+
+config SPLIT_IRQ
+    bool

hw/core/Makefile.objs

@@ -19,7 +19,7 @@ common-obj-$(CONFIG_FITLOADER) += loader-fit.o
 common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
 common-obj-$(CONFIG_REGISTER) += register.o
 common-obj-$(CONFIG_OR_IRQ) += or-irq.o
-common-obj-$(CONFIG_SOFTMMU) += split-irq.o
+common-obj-$(CONFIG_SPLIT_IRQ) += split-irq.o
 common-obj-$(CONFIG_PLATFORM_BUS) += platform-bus.o
 common-obj-$(CONFIG_SOFTMMU) += generic-loader.o
 common-obj-$(CONFIG_SOFTMMU) += null-machine.o