staging: rtl8188eu: Fix static symbol sparse warnings

Fix sparse warnings:
drivers/staging/rtl8188eu/core/rtw_cmd.c:52:5: warning:
  symbol '_rtw_enqueue_cmd' was not declared. Should it be static?
drivers/staging/rtl8188eu/core/rtw_wlan_util.c:1225:5: warning:
  symbol 'wifirate2_ratetbl_inx' was not declared. Should it be static?
drivers/staging/rtl8188eu/hal/HalPhyRf_8188e.c:25:4: warning:
  symbol 'ODM_GetRightChnlPlaceforIQK' was not declared. Should it be static?
drivers/staging/rtl8188eu/os_dep/ioctl_linux.c:3109:5: warning:
  symbol 'rtw_ioctl' was not declared. Should it be static?
Signed-off-by: NJeff Oczek <jeffoczek@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_cmd.c

@@ -49,7 +49,7 @@ ISR/Call-Back functions can't call this sub-function.
 
 */
 
-int _rtw_enqueue_cmd(struct __queue *queue, struct cmd_obj *obj)
+static int _rtw_enqueue_cmd(struct __queue *queue, struct cmd_obj *obj)
 {
 	unsigned long irqL;
 

drivers/staging/rtl8188eu/core/rtw_wlan_util.c

@@ -1222,7 +1222,7 @@ unsigned int is_ap_in_wep(struct adapter *padapter)
 	}
 }
 
-int wifirate2_ratetbl_inx(unsigned char rate)
+static int wifirate2_ratetbl_inx(unsigned char rate)
 {
 	int	inx = 0;
 	rate = rate & 0x7f;

drivers/staging/rtl8188eu/hal/HalPhyRf_8188e.c

@@ -22,7 +22,7 @@
 #define		ODM_TXPWRTRACK_MAX_IDX_88E		6
 
 
-u8 ODM_GetRightChnlPlaceforIQK(u8 chnl)
+static u8 ODM_GetRightChnlPlaceforIQK(u8 chnl)
 {
 	u8	channel_all[ODM_TARGET_CHNL_NUM_2G_5G] = {
 		1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,

drivers/staging/rtl8188eu/os_dep/ioctl_linux.c

@@ -32,6 +32,7 @@
 
 #include <rtw_iol.h>
 #include <linux/vmalloc.h>
+#include "osdep_intf.h"
 
 #define RTL_IOCTL_WPA_SUPPLICANT	(SIOCIWFIRSTPRIV + 30)