rtl8188eu: Clean up the section that reads the EEPROM

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8188eu: Simplify handling of LE variables

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8188eu: Remove macro RTW_GET_LE16

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>