Convert xml based API allowDynamicSummaryInSlice to java

- Add boolean useDynamicSliceSummary() in Sliceable interface. This is
  the switch equivalent to android:allowDynamicSummaryInSlice in xml. It
  moves the setter closer to regular Sliceable APIs, thus less easily to
  miss.
- Coverted all android:allowDynamicSummaryInSlice to use the java API.
  - Except 2 prefs in my_device_info. They incorrectly set this to true
  previously (controller is not sliceable, no point setting
  dynamicSliceSummary to true. They just won't do anything)

Fixes: 128446156
Test: robolectric
Change-Id: Ic57acd590dec3e87dcf4592df137321d14b854d9

res/xml/hardware_info.xml

@@ -27,7 +27,6 @@
         android:key="hardware_info_device_model"
         android:title="@string/model_info"
         android:summary="@string/summary_placeholder"
-        settings:allowDynamicSummaryInSlice="true"
         settings:controller="com.android.settings.deviceinfo.hardwareinfo.DeviceModelPreferenceController"
         settings:enableCopying="true"/>
 
@@ -36,7 +35,6 @@
         android:key="hardware_info_device_serial"
         android:title="@string/status_serial_number"
         android:summary="@string/summary_placeholder"
-        settings:allowDynamicSummaryInSlice="true"
         settings:controller="com.android.settings.deviceinfo.hardwareinfo.SerialNumberPreferenceController"
         settings:enableCopying="true"/>
 
@@ -45,7 +43,6 @@
         android:key="hardware_info_device_revision"
         android:title="@string/hardware_revision"
         android:summary="@string/summary_placeholder"
-        settings:allowDynamicSummaryInSlice="true"
         settings:controller="com.android.settings.deviceinfo.hardwareinfo.HardwareRevisionPreferenceController"
         settings:enableCopying="true"/>