libnetworkstats_test: set min_sdk_version=33

Without a set min_sdk_version the tests are built for
tip-of-tree which implies a 5.10+ kernel which then
results in them failing when installed on pixel 4/5
test devices with 4.14/4.19 kernels.

(Not sure how this ever worked, that should in
theory always have been illegal... I guess we've
been lucky...)

Bug: 439093090
Bug: 439218498
Flag: EXEMPT mainline
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I2b02d314f70f771cb4d29758fe5dfe557a664638
1 file changed