rtl8188eu: Make necessary changes for 3.14 kernel changes

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8188eu: Fix compilation for kernels older that 2.6.36

These changes will apply at least back to 2.6.32.

From: Stas Sergeev <stsp@list.ru>
Signed-off-by: Stas Sergeev <stsp@list.ru>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>