feat(kobject,ktimer,printf): Kernel object added attribute, kernel timer ADAPTS attribute operation, fix printf print error.

1.Added attributes of kernel objects. You can directly manipulate the attributes supported by objects by running show and store.
2.The kernel timer has three attributes: tick,mode, and status. Because of the danger of OS operations, attributes are not supported by kernel OS objects.
3.Kernel printf has a bug when printing strings, an incorrect comparison condition causes the print to be missing content.

include/libc/Kconfig

@@ -69,7 +69,7 @@ menu "Libc options"
     # PRINTF
     choice
         prompt "Printf"
-        default MR_USE_PRINTFK
+        default MR_USE_PRINTF
 
         config MR_USE_LIBC_PRINTF
             bool "Standard libc printf"
@@ -86,6 +86,26 @@ menu "Libc options"
             help
               Use a custom printf implementation for printing.
     endchoice
+    # SCANF
+    choice
+        prompt "Scanf"
+        default MR_USE_SCANF
+
+        config MR_USE_LIBC_SCANF
+            bool "Standard libc scanf"
+            help
+              Use the standard libc scanf for scanf.
+
+        config MR_USE_3PARTY_SCANF
+            bool "3rd party scanf"
+            help
+              Use a third-party scanf library for scanf.
+
+        config MR_USE_SCANF
+            bool "Custom scanf"
+            help
+              Use a custom scanf implementation for scanf.
+    endchoice
     # STRING
     choice
         prompt "String"
@@ -121,6 +141,7 @@ menu "Libc options"
             help
               Use a custom type implementation for custom types.
     endchoice
+    # 64BIT
     config MR_USE_64BIT
         bool "Use 64-bit"
         default n