Android: Set use appropriate android.jar for androidx_privacysandbox_ads_ads_adservices_java

This should fix the androidx autoroller.

Also removes logic for naming lib.java/ and .ijar.jar files according to
the input .jar file's name rather than the target's name. I don't know
why we ever did that, but it caused an error for defining another
alternative_android_sdk_dep() target due to the input files being named
"android.jar".

Bug: 1412277
Change-Id: I526267390ee20f71195b391ee2a1c2d01167ac61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4215925
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1100404}
NOKEYCHECK=True
GitOrigin-RevId: ef6d6e0c1bc7a5dd0c9d26b34bc454589e6b1550