staging: r8188eu: remove two unused defines

The C2H_MEM_SZ and FREE_CMDOBJ_SZ defines are not used by the r8188eu
driver. Remove them.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221015151115.232095-7-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/rtw_cmd.h

@@ -8,13 +8,9 @@
 #include "rtw_rf.h"
 #include "rtw_led.h"
 
-#define C2H_MEM_SZ (16*1024)
-
 #include "osdep_service.h"
 #include "ieee80211.h" /*  <ieee80211/ieee80211.h> */
 
-#define FREE_CMDOBJ_SZ	128
-
 #define MAX_CMDSZ	1024
 #define MAX_RSPSZ	512
 #define MAX_EVTSZ	1024