Add desktop Trusty genrules

armellel@ recommended that new desktop genrules be placed here alongside
the security genrules, rather than modifying the "system" target.

This limits the impact of desktop changes on the regular Trusty security vm.

Bug: 398934069
Test: m trusty_desktop{,_test}_vm_{arm64.bin,x86_64.elf}
Change-Id: If1d88000f3fd2d717b291ff1af7d62ea9f9d8edc
1 file changed