dmaengine: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/idxd/idxd.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/ti/omap-dma.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/dmatest.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/ioat/ioatdma.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240606-md-drivers-dma-v2-1-0770dfdf74dd@quicinc.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dmatest.c

@@ -1372,4 +1372,5 @@ static void __exit dmatest_exit(void)
 module_exit(dmatest_exit);
 
 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
+MODULE_DESCRIPTION("DMA Engine test module");
 MODULE_LICENSE("GPL v2");

drivers/dma/idxd/init.c

@@ -22,6 +22,7 @@
 #include "perfmon.h"
 
 MODULE_VERSION(IDXD_DRIVER_VERSION);
+MODULE_DESCRIPTION("Intel Data Streaming Accelerator and In-Memory Analytics Accelerator common driver");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Intel Corporation");
 MODULE_IMPORT_NS(IDXD);

drivers/dma/ioat/init.c

@@ -23,6 +23,7 @@
 #include "../dmaengine.h"
 
 MODULE_VERSION(IOAT_DMA_VERSION);
+MODULE_DESCRIPTION("Intel I/OAT DMA Linux driver");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Intel Corporation");
 

drivers/dma/ti/omap-dma.c

@@ -1950,4 +1950,5 @@ static void __exit omap_dma_exit(void)
 module_exit(omap_dma_exit);
 
 MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Texas Instruments sDMA DMAengine support");
 MODULE_LICENSE("GPL");