pipeline: meson: Allow nested pipeline handler directory structures

The current pipeline handler build files require a flat directory
struture for each pipeline handler. Modify the build files to remove
this restriction and allow a directory structure such as:

src/libcamera/pipeline/
  |- raspberrypi
      |- common
      |- vc4
  |- rkisp1
  |- ipu3

where each subdir (e.g. raspberrypi/common, raspberrypi/vc4) has its own
meson.build file. Such a directory structure will be introduced for the
Raspberry Pi pipeline handler in a future commit.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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