libcamera: base: log: Use std::string_view to avoid some copies

Use `std::string_view` to avoid some largely unnecessary copies, and
to make string comparisong potentially faster by eliminating repeated
`strlen()` calls.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

include/libcamera/base/log.h

@@ -9,6 +9,7 @@
 
 #include <atomic>
 #include <sstream>
+#include <string_view>
 
 #include <libcamera/base/private.h>
 
@@ -29,7 +30,7 @@ enum LogSeverity {
 class LogCategory
 {
 public:
-	static LogCategory *create(const char *name);
+	static LogCategory *create(std::string_view name);
 
 	const std::string &name() const { return name_; }
 	LogSeverity severity() const { return severity_.load(std::memory_order_relaxed); }
@@ -38,7 +39,7 @@ public:
 	static const LogCategory &defaultCategory();
 
 private:
-	explicit LogCategory(const char *name);
+	explicit LogCategory(std::string_view name);
 
 	const std::string name_;