hostapd: revert signature change in patch

The original wpa_hexdump uses a 'void *' for the payload.  With patch
410-limit_debug_messages, the signature changes and compiler warnings
occur at various places.  One such warning is:

 wpa_debug.h:106:20: note: expected 'const u8 * {aka const unsigned char *}' but argument is of type 'struct wpa_eapol_key *'

Signed-off-by: Leon M. George <leon@georgemail.eu>
[commit message facelift]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/network/services/hostapd/patches/410-limit_debug_messages.patch

@@ -124,7 +124,7 @@
   * configuration. The contents of buf is printed out has hex dump.
   */
 -void wpa_hexdump(int level, const char *title, const void *buf, size_t len);
-+static inline void wpa_hexdump(int level, const char *title, const u8 *buf, size_t len)
++static inline void wpa_hexdump(int level, const char *title, const void *buf, size_t len)
 +{
 +	if (level < CONFIG_MSG_MIN_PRIORITY)
 +		return;