dmaengine: ti: add missing MODULE_DESCRIPTION() macros

With ARCH=arm64, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/ti/k3-udma.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/ti/k3-udma-glue.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/ti/k3-psil-lib.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240613-md-arm64-drivers-dma-ti-v1-1-b1154603f341@quicinc.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>