Rename fields in dexpreopt config

Add 'host' into the name of fields regarding path on the host side to
distinguish between paths on the device(which will be added in the
following commit), and paths on the host.

Bug: 158843648
Test: build and flash, and then
  adb wait-for-device \
    && adb -s $S root \
    && adb -s $S logcat \
    | grep -E 'ClassLoaderContext [a-z ]+ mismatch' -C 1
Change-Id: Ib2645ed51591ba2f4b726c115b401ad2bd6675da

dexpreopt/dexpreopt_test.go

@@ -48,7 +48,7 @@ func testModuleConfig(ctx android.PathContext, name, partition string) *ModuleCo
 		ClassLoaderContexts:             nil,
 		Archs:                           []android.ArchType{android.Arm},
 		DexPreoptImagesDeps:             []android.OutputPaths{android.OutputPaths{}},
-		DexPreoptImageLocations:         []string{},
+		DexPreoptImageLocationsOnHost:   []string{},
 		PreoptBootClassPathDexFiles:     nil,
 		PreoptBootClassPathDexLocations: nil,
 		PreoptExtractedApk:              false,