Allow customizing WearRecoveryUI via Makefile variables.

With the following Makefile variables, we can reduce the work of writing
(copy/pasting) device-specific WearRecoveryUI classes.

The list of Makefile variables (the ones useful for Wear devices):
- TARGET_RECOVERY_UI_MARGIN_HEIGHT (default: 0)
- TARGET_RECOVERY_UI_MARGIN_WIDTH (default: 0)
  Specify the margin space that we don't want to display texts. They
  replace the former outer_width and outer_height.

- TARGET_RECOVERY_UI_TOUCH_LOW_THRESHOLD (default: 50)
- TARGET_RECOVERY_UI_TOUCH_HIGH_THRESHOLD (default: 90)
  Specify the sensitivity of recognizing a swipe. Devices give absolute
  positions, so for some devices we need to adjust the thresholds.

- TARGET_RECOVERY_UI_PROGRESS_BAR_BASELINE
  Specify the progress bar vertical position, which should be adjusted
  to the actual height of a device. It replaces the former
  progress_bar_y.

- TARGET_RECOVERY_UI_ANIMATION_FPS (default: 30)
  Specify the animation FPS if using device-specific animation images.
  It replaces the former animation_fps.

Devices can specify "TARGET_RECOVERY_UI_LIB := librecovery_ui_wear",
with optionally defined Makefile vars above, in BoardConfig.mk to
customize their WearRecoveryUI.

Also remove the obsolete wear_touch.{cpp,h}, which has been merged into
ui.cpp in commit 5f8dd9951d986b65d98d6a9ea38003427e9e46df.

Bug: 64307776
Test: Change the device BoardConfig.mk and test recovery image.
Change-Id: Id0fb2d4e3977ab5ddd31e71f9535470cab70e41b
(cherry picked from commit 0470ceea381775b09eee931858c3320be88cc637)
diff --git a/wear_ui.h b/wear_ui.h
index a814118..c2bbdb6 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -42,10 +42,7 @@
 
  protected:
   // progress bar vertical position, it's centered horizontally
-  int progress_bar_y;
-
-  // outer of window
-  int outer_height, outer_width;
+  const int kProgressBarBaseline;
 
   // Unusable rows when displaying the recovery menu, including the lines for headers (Android
   // Recovery, build id and etc) and the bottom lines that may otherwise go out of the screen.