msm: camera: common: Import dma-buf heap name space

Due to dma-buf symbols into the dma_buf module namespace,
when use them, need to import dma-buf name space.

CRs-Fixed: 3245719
Change-Id: I57bb808c675105bf567f7a628fb88c3259512721
Signed-off-by: zhuo <quic_zhuo@quicinc.com>

drivers/cam_utils/cam_compat.h

@@ -32,6 +32,10 @@
 #include <linux/qcom-dma-mapping.h>
 #endif
 
+#if KERNEL_VERSION(5, 18, 0) <= LINUX_VERSION_CODE
+MODULE_IMPORT_NS(DMA_BUF);
+#endif
+
 struct cam_fw_alloc_info {
 	struct device *fw_dev;
 	void          *fw_kva;