disp: sde: add CRTC property for VM requests

Add a CRTC property to request the VM to acquire/release
HW resources.

Display driver in trusted VM boots up without HW ownership. Set
the default value of the property as RELEASED to handle resource
assignments.

Change-Id: Iea651a2fea902d95d4b954052af4ef016af15a91
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>

msm/sde/sde_crtc.h

@@ -88,6 +88,18 @@ enum sde_crtc_cache_state {
 	CACHE_STATE_FRAME_READ
 };
 
+/**
+ * enum sde_crtc_vm_req: request for VM operations
+ * @VM_REQ_NONE: no request. Normal VM operations.
+ * @VM_REQ_RELEASE: request to release the HW resources from the current VM
+ * @VM_REQ_ACQUIRE: request to acquire the HW resources in the current VM
+ */
+enum sde_crtc_vm_req {
+	VM_REQ_NONE,
+	VM_REQ_RELEASE,
+	VM_REQ_ACQUIRE,
+};
+
 /**
  * @connectors    : Currently associated drm connectors for retire event
  * @num_connectors: Number of associated drm connectors for retire event