ipa: ipa_interface: Declare ipaCreate() in libcamera namespace

The ipaCreate() function is the entry point to IPA modules. It is
declared in ipa_interface.h, and defined by each module. As the function
is defined with extern "C" linkage, the namespace in which it is
contained is not very relevant from a caller's point of view. For the
IPA module implementer, however, defining the function in the libcamera
namespace avoids adding an explicit libcamera:: prefix to the symbols
used by the function. This is why all IPA modules define their
ipaCreate() entry point in the libcamera namespace.

The ipa_interface.h file, however, declares the function in the global
namespace. This doesn't cause any issue at runtime, but will cause a
missing declaration warning when we enable them. To prepare for that,
move the function declaration to the libcamera namespace.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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