board: lg: Remove <common.h> and add needed includes

Remove <common.h> from this board vendor directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/lg/sniper/sniper.c b/board/lg/sniper/sniper.c
index 86032d7..88d5d08 100644
--- a/board/lg/sniper/sniper.c
+++ b/board/lg/sniper/sniper.c
@@ -6,7 +6,6 @@
  */
 
 #include <config.h>
-#include <common.h>
 #include <dm.h>
 #include <env.h>
 #include <fastboot.h>