zvfs: Use own macros and remove include

Use the zvfs macros in the code of the module itself, instead of using
the versions from the POSIX API, and remove the header that defined those
as it is not needed anymore.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

Author: aescolar

lib/os/zvfs/zvfs_eventfd.c

@@ -8,7 +8,6 @@
 
 #include <zephyr/kernel.h>
 #include <zephyr/net/socket.h>
-#include <zephyr/posix/fcntl.h>
 #include <zephyr/zvfs/eventfd.h>
 #include <zephyr/sys/bitarray.h>
 #include <zephyr/sys/fdtable.h>
@@ -229,11 +228,11 @@ static int zvfs_eventfd_ioctl_op(void *obj, unsigned int request, va_list args)
 	}
 
 	switch (request) {
-	case F_GETFL:
+	case ZVFS_F_GETFL:
 		ret = efd->flags & ZVFS_EFD_FLAGS_SET;
 		break;
 
-	case F_SETFL: {
+	case ZVFS_F_SETFL: {
 		int flags;
 
 		flags = va_arg(args, int);