dmaengine: qcom: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/qcom/hdma_mgmt.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/qcom/hdma.o

Add the missing invocations of the MODULE_DESCRIPTION() macro, using
the descriptions from the associated Kconfig items.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://lore.kernel.org/r/20240603-md-drivers-dma-qcom-v1-1-d1bd919352bf@quicinc.com


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