Drop GkiInstallTest from TEST_MAPPING.

The test no longer matters and we do not care about whether
it regresses or not.

Test: TH
Bug: 259427298
Change-Id: I28d86b453633afd0c15e2cb1ce021c05fb0c49f9
(cherry picked from commit ece1d1dfd23111d99878349b216370852f6e98e4)
1 file changed