video: driver: select target and vpu variant based on dtsi

- enable conditional compilation based on defconfig
- compile only needed files based target & vpu variant
- enabled stubs to avoid compilation issues, for all
  target variant and vpu types
- add support for qcv(same lunch combo) for different
  PT & VT chipsets.

Change-Id: Ic446349fd1532885d7a2e94895d807c62f1ab6e4
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>

driver/variant/iris2/inc/msm_vidc_iris2.h

@@ -3,14 +3,23 @@
  * Copyright (c) 2020-2021,, The Linux Foundation. All rights reserved.
  */
 
+#ifndef _MSM_VIDC_IRIS2_H_
+#define _MSM_VIDC_IRIS2_H_
+
 #include "msm_vidc_core.h"
 
-//#if defined(CONFIG_MSM_VIDC_IRIS2)
+#if defined(CONFIG_MSM_VIDC_IRIS2)
 int msm_vidc_init_iris2(struct msm_vidc_core *core);
-//#else
-//static inline int msm_vidc_init_iris2(struct msm_vidc_core *core)
-//{
-//	return -EINVAL;
-//}
-//#endif
 int msm_vidc_deinit_iris2(struct msm_vidc_core *core);
+#else
+static inline int msm_vidc_init_iris2(struct msm_vidc_core *core)
+{
+	return -EINVAL;
+}
+static inline int msm_vidc_deinit_iris2(struct msm_vidc_core *core)
+{
+	return -EINVAL;
+}
+#endif
+
+#endif // _MSM_VIDC_IRIS2_H_