Allow cmd package suspend for secondary users.

See also: ag/6459825

bug: 124844866
Test: From a secondary user:
cts-tradefed run cts-dev -m CtsAppTestCases -t android.app.cts.NotificationManagerTest

Create user 10

$ adb install -r ./testcases/CtsAppTestStubs.apk
$ adb shell cmd package suspend android.app.stubs
Package android.app.stubs new suspended state: true
$ adb shell cmd package unsuspend android.app.stubs
Package android.app.stubs new suspended state: false
$ adb shell cmd package suspend --user 10 android.app.stubs
Package android.app.stubs new suspended state: true
$ adb shell cmd package unsuspend --user 10 android.app.stubs
Package android.app.stubs new suspended state: false
$ adb shell cmd package unsuspend --user 11 android.app.stubs
Security exception: Calling package com.android.shell in user 11 does not belong to calling uid 2000

java.lang.SecurityException: Calling package com.android.shell in user 11 does not belong to calling uid 2000
	at com.android.server.pm.PackageManagerService.setPackagesSuspendedAsUser(PackageManagerService.java:12878)
	at com.android.server.pm.PackageManagerShellCommand.runSuspend(PackageManagerShellCommand.java:1845)
	at com.android.server.pm.PackageManagerShellCommand.onCommand(PackageManagerShellCommand.java:223)
	at android.os.ShellCommand.exec(ShellCommand.java:103)
	at com.android.server.pm.PackageManagerService.onShellCommand(PackageManagerService.java:20670)
	at android.os.Binder.shellCommand(Binder.java:887)
	at android.os.Binder.onTransact(Binder.java:771)
	at android.content.pm.IPackageManager$Stub.onTransact(IPackageManager.java:4689)
	at com.android.server.pm.PackageManagerService.onTransact(PackageManagerService.java:3698)
	at android.os.Binder.execTransactInternal(Binder.java:1026)
	at android.os.Binder.execTransact(Binder.java:999)

Change-Id: I89ed4eaf95959175c6f366b8760f119abc05719e