[clang][MLGO] enable ml inliner on linux, when targeting android

This follows up https://crrev.com/c/3829793. Quoting from it:

Benchmarks (on an earlier tree):
Android GO speedometer2:
https://pinpoint-dot-chromeperf.appspot.com/job/14d399416a0000
(summary: 0.6% (regr) to -2.0% (improvement))

Pixel2 speedometer2:
https://pinpoint-dot-chromeperf.appspot.com/job/12f3871c6a0000
(summary: 2.3% (regr) to -1.1% (improvement))

Pixel4 speedometer2:
https://pinpoint-dot-chromeperf.appspot.com/job/14fd83d86a0000
(summary: 1.8% (regr) to -2.8% (improvement))

Size reductions (on an earlier tree):
arm32: -375KB
arm64: -1.35MB


Bug: 1241834
Change-Id: I4576bf9022ee084bec424d073a2a1e68e56fec6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3852308


Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1045024}