Handle restricting to device only builds

By default, most module types are only enabled for device. Converting
this behavior and host_supported/device_supported properties allows us
to skip building incompatible targets.

Test: soong tests
Test: bp2build.sh
Change-Id: If1da523b4cc8c4cbf2bb26da063d9923b662cc32

bp2build/apex_key_conversion_test.go

@@ -42,7 +42,7 @@ apex_key {
         private_key: "com.android.apogee.pem",
 }
 `,
-		expectedBazelTargets: []string{makeBazelTarget("apex_key", "com.android.apogee.key", attrNameToString{
+		expectedBazelTargets: []string{makeBazelTargetNoRestrictions("apex_key", "com.android.apogee.key", attrNameToString{
 			"private_key": `"com.android.apogee.pem"`,
 			"public_key":  `"com.android.apogee.avbpubkey"`,
 		}),