libc: update kernel library references

lib/libc/include/sys/mman.h

@@ -1,7 +1,7 @@
 #ifndef SYS_MMAN_H_
 #define SYS_MMAN_H_
 
-#include <mango/types.h>
+#include <magenta/types.h>
 #include <stddef.h>
 
 #define PROT_NONE           0x00u

lib/libc/include/sys/remote.h

@@ -1,7 +1,7 @@
 #ifndef SYS_REMOTE_H_
 #define SYS_REMOTE_H_
 
-#include <mango/types.h>
+#include <magenta/types.h>
 #include <stdbool.h>
 
 enum sys_remote_id {

lib/libc/include/sys/types.h

@@ -1,7 +1,7 @@
 #ifndef SYS_TYPES_H_
 #define SYS_TYPES_H_
 
-#include <mango/types.h>
+#include <magenta/types.h>
 
 #define SEEK_SET 0
 #define SEEK_CUR 1