Allow to build chip-cert with boringssl (#33226)

Currently when trying to build chip-cert with boringssl gn doesn't
generate a ninja target. This is since `chip_can_build_cert_tool` gets
set to false.

Allow to build with boringssl just like with openssl.
diff --git a/build/chip/tools.gni b/build/chip/tools.gni
index efb25d3..46c321d 100644
--- a/build/chip/tools.gni
+++ b/build/chip/tools.gni
@@ -19,7 +19,7 @@
   chip_build_tools = current_os != "freertos" && current_os != "android" &&
                      chip_device_platform != "fake"
   chip_can_build_cert_tool =
-      chip_crypto == "openssl" ||
+      chip_crypto == "openssl" || chip_crypto == "boringssl" ||
       (chip_crypto == "" &&
        (current_os != "android" && current_os != "freertos" &&
         current_os != "zephyr" && current_os != "mbed" &&