chore(devfs): remove [serial0] debug output

Keep the data written to /dev/serial0, drop the open/close/read/write
debug tags.

VKernel/Kernel/drivers/devfs/devfs.vp

@@ -338,21 +338,15 @@ def devfs_list_directory(path: const str, buffer: str, size: uint32) -> int:
 serial0_file: devfs_file* = devfs_file()
 
 def serial0_open(self: rawptr, path: const str, flags: int) -> int:
-    serial.puts("[serial0] open: ")
-    serial.puts(path)
-    serial.puts("\n")
     return 0
 
 def serial0_close(self: rawptr, fd: int) -> int:
-    serial.puts("[serial0] close\n")
     return 0
 
 def serial0_read(self: rawptr, fd: int, buffer: rawptr, size: uint32) -> int:
-    serial.puts("[serial0] read\n")
     return 0
 
 def serial0_write(self: rawptr, fd: int, buffer: const rawptr, size: uint32) -> int:
-    serial.puts("[serial0] write\n")
     serial.puts(buffer)
     serial.puts("\n")
     return size