drivers: mbox: secureproxy: Pass userdata in isr

This change modifies the secure proxy mailbox driver to pass user data
to the interrupt service routine (ISR) callback. This allows the ISR
to access the specific context or data associated with the mailbox
message being processed.

Signed-off-by: Dave Joseph <d-joseph@ti.com>

drivers/mbox/mbox_ti_secproxy.c

@@ -201,7 +201,7 @@ static void secproxy_mailbox_isr(const struct device *dev)
 		rx_data->size = msg_len;
 		rx_data->seq = GET_MSG_SEQ(buf);
 		if (data->cb[i_channel]) {
-			data->cb[i_channel](dev, i_channel, NULL, NULL);
+			data->cb[i_channel](dev, i_channel, data->user_data[i_channel], NULL);
 		}
 	}
 }