rtlwifi: rtl8192ce: rtl8192cu: Fix multiple def errors for allyesconfig build

As noted by Stephan Rothwell, an allyesconfig build fails since rtl8192cu
was merged with failures such as:

drivers/net/wireless/rtlwifi/rtl8192cu/built-in.o: In function `rtl92c_phy_sw_chnl':
(.opd+0xf30): multiple definition of `rtl92c_phy_sw_chnl'
drivers/net/wireless/rtlwifi/rtl8192ce/built-in.o:(.opd+0xb70): first defined here
drivers/net/wireless/rtlwifi/rtl8192cu/built-in.o: In function `rtl92c_fill_h2c_cmd':
(.opd+0x288): multiple definition of `rtl92c_fill_h2c_cmd'
drivers/net/wireless/rtlwifi/rtl8192ce/built-in.o:(.opd+0x288): first defined here

These are caused because the code shared between rtl8192ce and rtl8192cu
is included in both drivers. This has been fixed by creating a new modue that
contains the shared code.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtlwifi/Kconfig b/drivers/net/wireless/rtlwifi/Kconfig
index 86f8d4d..ce49e0c 100644
--- a/drivers/net/wireless/rtlwifi/Kconfig
+++ b/drivers/net/wireless/rtlwifi/Kconfig
@@ -3,6 +3,7 @@
 	depends on MAC80211 && PCI && EXPERIMENTAL
 	select FW_LOADER
 	select RTLWIFI
+	select RTL8192C_COMMON
 	---help---
 	This is the driver for Realtek RTL8192CE/RTL8188CE 802.11n PCIe
 	wireless network adapters.
@@ -14,6 +15,7 @@
 	depends on MAC80211 && USB && EXPERIMENTAL
 	select FW_LOADER
 	select RTLWIFI
+	select RTL8192C_COMMON
 	---help---
 	This is the driver for Realtek RTL8192CU/RTL8188CU 802.11n USB
 	wireless network adapters.
@@ -24,3 +26,8 @@
 	tristate
 	depends on RTL8192CE || RTL8192CU
 	default m
+
+config RTL8192C_COMMON
+	tristate
+	depends on RTL8192CE || RTL8192CU
+	default m