accel/Kconfig: Extract accel selectors into their own config

Move the accel selectors from the global Kconfig.host to their
own Kconfig file.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Kconfig.host

@@ -2,9 +2,6 @@
 # down to Kconfig.  See also MINIKCONF_ARGS in the Makefile:
 # these two need to be kept in sync.
 
-config KVM
-    bool
-
 config LINUX
     bool
 
@@ -31,10 +28,6 @@ config VHOST_KERNEL
     bool
     select VHOST
 
-config XEN
-    bool
-    select FSDEV_9P if VIRTFS
-
 config VIRTFS
     bool
 

Makefile

@@ -420,6 +420,7 @@ MINIKCONF_ARGS = \
 
 MINIKCONF_INPUTS = $(SRC_PATH)/Kconfig.host \
                    $(SRC_PATH)/backends/Kconfig \
+                   $(SRC_PATH)/accel/Kconfig \
                    $(SRC_PATH)/hw/Kconfig
 MINIKCONF_DEPS = $(MINIKCONF_INPUTS) \
                  $(wildcard $(SRC_PATH)/hw/*/Kconfig)

accel/Kconfig

@@ -0,0 +1,6 @@
+config KVM
+    bool
+
+config XEN
+    bool
+    select FSDEV_9P if VIRTFS