Removes $(PRODUCT_OUT)/misc_info.txt on installclean.

misc_info.txt's build rule does not contain inputs to tell it to
refresh on an incremental build, so incremental builds (even after
installclean) were reusing this file.

With this change, misc_info.txt is removed by installclean so that an
incremental build generates the file fresh.

Test: # misc_info.txt exists; m installclean; # misc_info.txt gone
Bug: 155930200
Change-Id: Ia319925dad26f98049a988ee1ceb1e20db621353