staging: rtl8192u: make in r8180_93cx6.c some local functions static

Make some local functions (eprom_cs, eprom_ck_cycle, eprom_w, eprom_r
and eprom_send_bits_string) static

Fix the following sparse warnings in r8180_93cx6.c

drivers/staging/rtl8192u/r8180_93cx6.c:23:6: warning: symbol 'eprom_cs' was not declared. Should it be static?
drivers/staging/rtl8192u/r8180_93cx6.c:40:6: warning: symbol 'eprom_ck_cycle' was not declared. Should it be static?
drivers/staging/rtl8192u/r8180_93cx6.c:56:6: warning: symbol 'eprom_w' was not declared. Should it be static?
drivers/staging/rtl8192u/r8180_93cx6.c:71:7: warning: symbol 'eprom_r' was not declared. Should it be static?
drivers/staging/rtl8192u/r8180_93cx6.c:85:6: warning: symbol 'eprom_send_bits_string' was not declared. Should it be static?
Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

drivers/staging/rtl8192u/r8180_93cx6.c

@@ -20,7 +20,7 @@
 
 #include "r8180_93cx6.h"
 
-void eprom_cs(struct net_device *dev, short bit)
+static void eprom_cs(struct net_device *dev, short bit)
 {
 	u8 cmdreg;
 
@@ -37,7 +37,7 @@ void eprom_cs(struct net_device *dev, short bit)
 }
 
 
-void eprom_ck_cycle(struct net_device *dev)
+static void eprom_ck_cycle(struct net_device *dev)
 {
 	u8 cmdreg;
 
@@ -53,7 +53,7 @@ void eprom_ck_cycle(struct net_device *dev)
 }
 
 
-void eprom_w(struct net_device *dev,short bit)
+static void eprom_w(struct net_device *dev,short bit)
 {
 	u8 cmdreg;
 
@@ -68,7 +68,7 @@ void eprom_w(struct net_device *dev,short bit)
 }
 
 
-short eprom_r(struct net_device *dev)
+static short eprom_r(struct net_device *dev)
 {
 	u8 bit;
 
@@ -82,7 +82,7 @@ short eprom_r(struct net_device *dev)
 }
 
 
-void eprom_send_bits_string(struct net_device *dev, short b[], int len)
+static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
 {
 	int i;