staging/gdm72xx: Include corresponding header file (fix sparse warning)

sdio_boot.c and netlink_k.c both have a corresponding header file with
their function prototypes but fail to include them, which leads to the
following sparse warnings:
sdio_boot.c:135:5: warning: symbol 'sdio_boot' was not declared. Should it be static?
netlink_k.c:89:13: warning: symbol 'netlink_init' was not declared. Should it be static?
netlink_k.c:109:6: warning: symbol 'netlink_exit' was not declared. Should it be static?
netlink_k.c:114:5: warning: symbol 'netlink_send' was not declared. Should it be static?

-> Add the include files and silence the warning
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm72xx/netlink_k.c

@@ -18,6 +18,7 @@
 #include <linux/netlink.h>
 #include <asm/byteorder.h>
 #include <net/sock.h>
+#include "netlink_k.h"
 
 #if !defined(NLMSG_HDRLEN)
 #define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))

drivers/staging/gdm72xx/sdio_boot.c

@@ -27,6 +27,7 @@
 #include <linux/firmware.h>
 
 #include "gdm_sdio.h"
+#include "sdio_boot.h"
 
 #define TYPE_A_HEADER_SIZE	4
 #define TYPE_A_LOOKAHEAD_SIZE   16