coresight: funnel: Allow funnel driver to be built as module

Allow to build coresight-funnel as module, for ease of development.

- combine static and dynamic funnel init into single
  module_init/exit call
- add funnel_remove functions, for module unload
- add a MODULE_DEVICE_TABLE for autoloading on boot

Cc: Mathieu Poirier <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Russell King <[email protected]>
Co-developed-by: Mian Yousaf Kaukab <[email protected]>
Tested-by: Mike Leach <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Mian Yousaf Kaukab <[email protected]>
Signed-off-by: Kim Phillips <[email protected]>
Signed-off-by: Tingwei Zhang <[email protected]>
Signed-off-by: Mathieu Poirier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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