Remove ui_print().

This used to be a helper function that allows printing message to UI.
We no longer have any active user in bootable/recovery. Device-specific
code can achieve the same functionality by calling GetUI()->Print()
instead.

Test: mmma -j bootable/recovery
Change-Id: If584fc8a51d1af466f1d94d8ea5faa262603a784
diff --git a/common.h b/common.h
index 22b2f0a..9cb44bd 100644
--- a/common.h
+++ b/common.h
@@ -14,11 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef RECOVERY_COMMON_H
-#define RECOVERY_COMMON_H
-
-#include <stdarg.h>
-#include <stdio.h>
+#pragma once
 
 #include <string>
 
@@ -39,9 +35,6 @@
 // The reason argument provided in "--reason=".
 extern const char* reason;
 
-void ui_print(const char* format, ...) __printflike(1, 2);
-
 bool is_ro_debuggable();
 
 bool SetUsbConfig(const std::string& state);
-#endif  // RECOVERY_COMMON_H