libcamera: Replace ARRAY_SIZE() with std::size()

C++17 has a std::size() function that returns the size of a C-style
array. Use it instead of the custom ARRAY_SIZE macro.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/utils.cpp

@@ -31,11 +31,6 @@ namespace libcamera {
 
 namespace utils {
 
-/**
- * \def ARRAY_SIZE(array)
- * \brief Determine the number of elements in the static array.
- */
-
 /**
  * \brief Strip the directory prefix from the path
  * \param[in] path The path to process