Slim down the sdk product

The sdk_phone_armv7 product is designed to build system images, which
adds unnecessary dependencies and enables unnecessary checks (such as
verifying dexpreopt artifacts).

Bug: 205008975
Test: m sdk sdk_repo dist && diff android-sdk.zip (only build.prop diffs)
Change-Id: I940655c39a3ae58839521416abafaf461df44921