Update pre-built apks in platform

Now include arm and x86 apks from built server

CtsShim (8.1.0-4396705)

./packages/CtsShim/apk/arm/CtsShim.apk
package: name='com.android.cts.ctsshim'
versionCode='27'
versionName='8.1.0-4396705'
platformBuildVersionName='8.1.0'
sdkVersion:'24'
targetSdkVersion:'24'

./packages/CtsShim/apk/arm/CtsShimPriv.apk
package: name='com.android.cts.priv.ctsshim'
versionCode='27'
versionName='8.1.0-4396705'
platformBuildVersionName='8.1.0'
sdkVersion:'24'
targetSdkVersion:'24'

./packages/CtsShim/apk/x86/CtsShim.apk
package: name='com.android.cts.ctsshim'
versionCode='27'
versionName='8.1.0-4396705'
platformBuildVersionName='8.1.0'
sdkVersion:'24'
targetSdkVersion:'24'

./packages/CtsShim/apk/x86/CtsShimPriv.apk
package: name='com.android.cts.priv.ctsshim'
versionCode='27'
versionName='8.1.0-4396705'
platformBuildVersionName='8.1.0'
sdkVersion:'24'
targetSdkVersion:'24'

Built here:
https://android-build.googleplex.com/builds/branch-dashboard/ub-ctsshim-dev?build_id=4396705

Final OC-MR1 drop for Oct 19th.

This build IS suitable for public release.

Bug: 64504762

Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.PrivilegedUpdateTests
Test: gts-tradefed run commandAndExit gts-dev --module GtsPackageManagerHostTestCases
Change-Id: I9a439f7287a8d3703cf014c7c03df2348a384a80