video: tegra: nvmap: Refactor nvmap_handle unit

- Files for nvmap_handle unit: nvmap_handle.c, nvmap_sci_ipc.c,
  nvmap_id_array.c.
- Define external header for nvmap_handle unit as nvmap_handle.h and
  move declarations of all external APIs of nvmap_handle unit to this
  header.
- Define internal header for nvmap_handle unit as nvmap_handle_int.h and
  move declarations of all internally called APIs to this header.

JIRA TMM-5651

Change-Id: Ie4922c0839070491f9893f23744eb700cabb9828
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3211591
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/video/tegra/nvmap/nvmap_dmabuf.c

@@ -34,6 +34,7 @@
 #include "nvmap_ioctl.h"
 #include "nvmap_alloc.h"
 #include "nvmap_dmabuf.h"
+#include "nvmap_handle.h"
 
 #define NVMAP_DMABUF_ATTACH  nvmap_dmabuf_attach