ipa: libipa: matrix: Fix incorrect symbol namespace

The matrixVlidateYaml() function is declared in the libcamera::ipa::
namespace, but defined in the libcamera:: namespace. This causes a
dynamic linking error at runtime. Fix it by moving the function
definition.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/ipa/libipa/matrix.cpp

@@ -122,8 +122,6 @@ namespace ipa {
  * \return Matrix sum of matrices \a m1 and \a m2
  */
 
-} /* namespace ipa */
-
 #ifndef __DOXYGEN__
 /*
  * The YAML data shall be a list of numerical values. Its size shall be equal
@@ -146,4 +144,6 @@ bool matrixValidateYaml(const YamlObject &obj, unsigned int size)
 }
 #endif /* __DOXYGEN__ */
 
+} /* namespace ipa */
+
 } /* namespace libcamera */