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>

include/libcamera/internal/utils.h

@@ -17,8 +17,6 @@
 #include <sys/time.h>
 #include <vector>
 
-#define ARRAY_SIZE(a)	(sizeof(a) / sizeof(a[0]))
-
 #ifndef __DOXYGEN__
 
 /* uClibc and uClibc-ng don't provide O_TMPFILE */