iwyu: Cleanup include headers

Triggered iwyu and add/remove used headers.

Change-Id: Iadbdb459563b3c89baf2d56f90a540342d020cd5
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/subprojects/ncsid/src/normalize_mac.c b/subprojects/ncsid/src/normalize_mac.c
index 6c6aa6c..db92cd5 100644
--- a/subprojects/ncsid/src/normalize_mac.c
+++ b/subprojects/ncsid/src/normalize_mac.c
@@ -15,6 +15,7 @@
  */
 
 #include <inttypes.h>
+#include <linux/if_ether.h>
 #include <net/ethernet.h>
 #include <stdio.h>