Revert "android: Roll 12L AVD configs to pick up 2GB ram size change."

This reverts commit f366bb019dc208469f614f162800a384116e13cb.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/5755226154860544

Sample build with failed test: https://ci.chromium.org/b/8742236192526837345
Affected test(s):
[ninja://chrome/android:chrome_public_test_apk/org.chromium.chrome.browser.media.PictureInPictureActivityTest#testExitOnBackToTab](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fchrome%2Fandroid:chrome_public_test_apk%2Forg.chromium.chrome.browser.media.PictureInPictureActivityTest%23testExitOnBackToTab?q=VHash%3A359dcabdb2bd6ffc)
[ninja://chrome/android:chrome_public_test_apk/org.chromium.chrome.browser.media.PictureInPictureActivityTest#testExitOnClose](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fchrome%2Fandroid:chrome_public_test_apk%2Forg.chromium.chrome.browser.media.PictureInPictureActivityTest%23testExitOnClose?q=VHash%3A359dcabdb2bd6ffc)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F5755226154860544&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F5709765&type=BUG

Original change's description:
> android: Roll 12L AVD configs to pick up 2GB ram size change.
>
> To pick up the CL https://crrev.com/c/5709101
> The AVDs are generated in https://ci.chromium.org/b/8742293395973948481
>
> Bug: 347759127, 352425580
> Change-Id: I29be528554eda0d4c41250dd6399c80f2809dd40
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5709765
> Commit-Queue: Haiyang Pan <hypan@google.com>
> Reviewed-by: Renuga Nanjappan <rnanjappan@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1328259}
>

Bug: 347759127, 352425580
Change-Id: I558bf0ec6117cae15c1ba6199cea9daedd22c3c1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5714775
Reviewed-by: Renuga Nanjappan <rnanjappan@chromium.org>
Reviewed-by: Haiyang Pan <hypan@google.com>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/main@{#1328485}