fix compile warnings in recovery, change images

gcc 4.4 complains about some of the recovery ui functions not being
declared.  To include the header, we have to fix the 'volatile'
declaration (otherwise there's a compiler error).

Move the dream-specific images to vendor/htc/dream, make the default
images a generic phone.
diff --git a/default_recovery_ui.c b/default_recovery_ui.c
index a2e4bea..d4e6204 100644
--- a/default_recovery_ui.c
+++ b/default_recovery_ui.c
@@ -29,11 +29,11 @@
                        "wipe cache partition",
                        NULL };
 
-int device_toggle_display(char* key_pressed, int key_code) {
+int device_toggle_display(volatile char* key_pressed, int key_code) {
     return key_code == KEY_HOME;
 }
 
-int device_reboot_now(char* key_pressed, int key_code) {
+int device_reboot_now(volatile char* key_pressed, int key_code) {
     return 0;
 }