Add support for the CPU Clock Override feature to Android UI

Source/Android/app/src/main/res/values/strings.xml

@@ -252,6 +252,10 @@
     <string name="dual_core_descrip">Split workload to two CPU cores instead of one. Increases speed.</string>
     <string name="fastmem">Fastmem</string>
     <string name="fastmem_desc">Uses potentially unsafe optimizations for memory access.</string>
+    <string name="overclock_enable">Override Emulated CPU Clock Speed</string>
+    <string name="overclock_enable_description">Higher values can make variable-framerate games run at a higher framerate, requiring a powerful device. Lower values make games run at a lower framerate, increasing emulation speed, but reducing the emulated console\'s performance.</string>
+    <string name="overclock_title">Emulated CPU Clock Speed</string>
+    <string name="overclock_warning">WARNING: Changing this from the default (100%) WILL break games and cause glitches. Please do not report bugs that occur with a non-default clock.</string>
 
     <!-- Video Preference Fragment -->
     <string name="video_settings">Video</string>

Source/Android/app/src/main/res/xml/preferences.xml

@@ -19,6 +19,21 @@
             android:entries="@array/string_emu_cores"
             android:entryValues="@array/int_emu_cores"/>
 
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="OverclockEnable"
+            android:summary="@string/overclock_enable_description"
+            android:title="@string/overclock_enable"
+            />
+
+        <org.dolphinemu.dolphinemu.utils.SliderPreference
+            android:dependency="OverclockEnable"
+            android:defaultValue="100"
+            android:key="Overclock"
+            android:max="400"
+            android:title="@string/overclock_title"
+            />
+
     </PreferenceCategory>
 
     <PreferenceCategory