Update prebuilt shims

Built here:
https://android-build.googleplex.com/builds/branch-dashboard/ub-ctsshim-dev?build_id=5374186

./arm/CtsShim.apk
package: name='com.android.cts.ctsshim'
versionCode='28'
versionName='9-5374186'
platformBuildVersionName='9'
platformBuildVersionCode='28'
compileSdkVersion='28'
compileSdkVersionCodename='9'
sdkVersion:'24'
targetSdkVersion:'28'

./arm/CtsShimPriv.apk
package: name='com.android.cts.priv.ctsshim'
versionCode='28'
versionName='9-5374186'
platformBuildVersionName='9'
platformBuildVersionCode='28'
compileSdkVersion='28'
compileSdkVersionCodename='9'
sdkVersion:'24'
targetSdkVersion:'28'

./x86/CtsShim.apk
package: name='com.android.cts.ctsshim'
versionCode='28'
versionName='9-5374186'
platformBuildVersionName='9'
platformBuildVersionCode='28'
compileSdkVersion='28'
compileSdkVersionCodename='9'
sdkVersion:'24'
targetSdkVersion:'28'

./x86/CtsShimPriv.apk
package: name='com.android.cts.priv.ctsshim'
versionCode='28'
versionName='9-5374186'
platformBuildVersionName='9'
platformBuildVersionCode='28'
compileSdkVersion='28'
compileSdkVersionCodename='9'
sdkVersion:'24'
targetSdkVersion:'28'

Bug: 121306802
Test: cts-tradefed run commandAndExit cts-dev --module CtsAppSecurityHostTestCases --test android.appsecurity.cts.PrivilegedUpdateTests
Change-Id: I70cd5154cd48117bdc5cf8a8714602ef8a7921d4