ANDROID: cuttlefish_defconfig: Enable DEBUG_SET_MODULE_RONX

This feature is required by the KernelConfigTest#testConfigROData
security CTS test. It was already a base option in kernel/configs and
was enabled in the arm64 defconfig. It was simply missed for x86_64.

As we do not currently use kernel modules on cuttlefish this option
should have no other effect.

Bug: 124521452
Test: booted cuttlefish with updated kernel (x86_64)
Change-Id: Id6ab679b2412159d2f8c8e72b683bd2dee59e512
Signed-off-by: Alistair Strachan <astrachan@google.com>