Introduce min_sdk_version to deps info.

Bug: 149622332
Test: m
Change-Id: Ie6568cb8a82d5cca9a3dc91b5a068abf4b0632dc

java/java.go

@@ -600,6 +600,10 @@ func (j *Module) targetSdkVersion() sdkSpec {
 	return j.sdkVersion()
 }
 
+func (j *Module) MinSdkVersion() string {
+	return j.minSdkVersion().version.String()
+}
+
 func (j *Module) AvailableFor(what string) bool {
 	if what == android.AvailableToPlatform && Bool(j.deviceProperties.Hostdex) {
 		// Exception: for hostdex: true libraries, the platform variant is created
@@ -2398,6 +2402,10 @@ func (j *Import) minSdkVersion() sdkSpec {
 	return j.sdkVersion()
 }
 
+func (j *Import) MinSdkVersion() string {
+	return j.minSdkVersion().version.String()
+}
+
 func (j *Import) Prebuilt() *android.Prebuilt {
 	return &j.prebuilt
 }