hostapd: revert signature change in patch

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>
(cherry picked from commit a123df275846b1b83aaf3d7488a1544f7c0e09aa)