emulator: use puresoftware keymaster

Currently emulator is using software keymaster
and this module will be removed soon.
Based on the suggestion of keymaster team,
the puresoftware keymaster should be used instead.
removing keystore.goldfish and keystore.ranchu
so puresoftware keymaster can be used.

BUG: 73378534
Test: build sdk_gphone_x86-userdebug
make -j
emulator
boots to homescreen
and pass majority of CtsKeystoreTestCases
failures drop from 100+ to 40+

Change-Id: I5093f5a0989e8aad0a69bbae3e8d789d8d8ae1bb