fix: add vcpu_features and kvm_capabilites to swagger

These fields were added in firecracker-microvm#3967 but the Swagger API definition was not
updated. This patch fixes the API definition.
Also, the field type is changed from "string" to "object", as it has
properties and thus can't be a string.

Signed-off-by: Riccardo Mancini <[email protected]>

Author: Manciukic

src/firecracker/swagger/firecracker.yaml

@@ -840,7 +840,7 @@ definitions:
     default: "None"
 
   CpuConfig:
-    type: string
+    type: object
     description:
       The CPU configuration template defines a set of bit maps as modifiers of flags accessed by register
       to be disabled/enabled for the microvm.
@@ -854,6 +854,12 @@ definitions:
       reg_modifiers:
         type: object
         description: A collection of registers to be modified. (aarch64)
+      vcpu_features:
+        type: object
+        description: A collection of vcpu features to be modified. (aarch64)
+      kvm_capabilities:
+        type: object
+        description: A collection of kvm capabilities to be modified. (aarch64)
 
   Drive:
     type: object