Allow flashing of images via the GUI

- Use the Images... button in the lower right of the zip install
  page
- Unify image flashing functions between restore and image flash
- boot and recovery partitions are flashable by default
- use fstab flag flashimg=1 or 0 to override defaults
- file system partitions are currently not flashable

Change-Id: I822dc446030543c55d2153e219d67a1292374ffc
diff --git a/gui/devices/1200x1920/res/ui.xml b/gui/devices/1200x1920/res/ui.xml
index 77af05b..c02032f 100644
--- a/gui/devices/1200x1920/res/ui.xml
+++ b/gui/devices/1200x1920/res/ui.xml
@@ -84,6 +84,7 @@
 		<variable name="row17_text_y" value="1455" />
 		<variable name="row18_text_y" value="1530" />
 		<variable name="zip_status_y" value="922" />
+		<variable name="flash_list_height" value="500" />
 		<variable name="tz_selected_y" value="240" />
 		<variable name="tz_set_y" value="1500" />
 		<variable name="tz_current_y" value="1425" />