android: camera_device: Use std::make_tuple()

Until N4387 (https://wg21.link/N4387, applied as a defect report for
C++11), a function could not return a tuple using
copy-list-initialization. This affects gcc-5 that was released before
N4387 was integrated, and causes a compilation error:

../../src/android/camera_device.cpp: In member function ‘std::tuple<unsigned int, unsigned int> CameraDevice::calculateStaticMetadataSize()’:
../../src/android/camera_device.cpp:391:32: error: converting to ‘std::tuple<unsigned int, unsigned int>’ from initializer list would use explicit constructor ‘constexpr std::tuple<_T1, _T2>::tuple(_U1&&, _U2&&) [with _U1 = unsigned int&; _U2 = unsigned int&; <template-parameter-2-3> = void; _T1 = unsigned int; _T2 = unsigned int]’
  return { numEntries, byteSize };

Fix it by using std::make_tuple().

Fixes: a80d38109f ("android: camera_device: Calculate metadata size")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/android/camera_device.cpp

@@ -388,7 +388,7 @@ std::tuple<uint32_t, uint32_t> CameraDevice::calculateStaticMetadataSize()
 	 */
 	byteSize += streamConfigurations_.size() * 52;
 
-	return { numEntries, byteSize };
+	return std::make_tuple(numEntries, byteSize);
 }
 
 /*