libcamera: span: Use default copy assignemnt operator

The custom implementation of the copy assignment operator is identical
to the one the compiler would generate. Replace it by the default.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/span.h

@@ -188,12 +188,7 @@ public:
 	}
 
 	constexpr Span(const Span &other) noexcept = default;
-
-	constexpr Span &operator=(const Span &other) noexcept
-	{
-		data_ = other.data_;
-		return *this;
-	}
+	constexpr Span &operator=(const Span &other) noexcept = default;
 
 	constexpr iterator begin() const { return data(); }
 	constexpr const_iterator cbegin() const { return begin(); }