RateLimitTest: increase rate limit to deflake test on low-end hw

RateLimitTest is flaky on ADT-3; it slightly exceeds the limit when
limiting at 1MB/s.
This may be related to using a tun instead of a tap interface. After
adding the interface MAC address to TestNetworkInterface, this test
should be adapted to use a tap interface and properly account for burst
size in U.

Bug: 231495412
Test: atest RateLimitTest
Change-Id: I645267d7143c2364c93998eaa71502e2aa10b5a6
(cherry picked from commit f8785cf1f9ecd810f58128488c5354316e2d57c1)
Merged-In: I645267d7143c2364c93998eaa71502e2aa10b5a6
1 file changed