libcamera: device_enumerator_udev: Use std::string_view

In `udevNotify()`, constructing an std::string from the device's
associated action is unnecessary as it is only compared against static
strings, and for that purpose an std::string_view works just as well,
while being cheaper to construct.

In the same vein, an std::string_view can be used to store the device's
devnode initially, and the string construction can be deferred until it
is needed.

Furthermore, previously `udev_device_get_devnode()` was called twice.
The extra call is now removed.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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