[nrf fromtree] lib: zvfs: Add default eventfd count for hostap

hostap needs more eventfd to function so set a proper default value.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
(cherry picked from commit 410afba)

Author: jukkar

lib/os/zvfs/Kconfig

@@ -25,6 +25,7 @@ if ZVFS_EVENTFD
 
 config ZVFS_EVENTFD_MAX
 	int "Maximum number of ZVFS eventfd's"
+	default 8 if WIFI_NM_WPA_SUPPLICANT
 	default 1
 	range 1 4096
 	help