Fix android extensions maven dependencies

`kotlin-android-extensions-runtime` and `kotlin-android-extensions-compiler`
had `com.google.android:android` as a provided dependency, but
during transition to Kotlin Gradle build the dependency was declared
as `runtime` instead of `compileOnly`.

plugins/android-extensions/android-extensions-runtime/build.gradle.kts

@@ -5,8 +5,7 @@ apply { plugin("kotlin") }
 
 dependencies {
     compile(project(":kotlin-stdlib"))
-    compile(ideaPluginDeps("layoutlib", plugin = "android"))
-    runtime(commonDep("com.google.android", "android"))
+    compileOnly(commonDep("com.google.android", "android"))
 }
 
 sourceSets {

prepare/android-extensions-compiler-gradle/build.gradle.kts

@@ -14,7 +14,7 @@ dependencies {
     compileOnly(project(":compiler:backend"))
     compileOnly(project(":kotlin-android-extensions-runtime"))
     runtime(projectRuntimeJar(":kotlin-compiler-embeddable"))
-    runtime(commonDep("com.google.android", "android"))
+    compileOnly(commonDep("com.google.android", "android"))
 }