Set __ANDROID_API__ for vendor modules to vndk version.

When building vendor modules with BOARD_VNDK_VERSION=current, the
API of the vendor modules will be current PLATFORM_VNDK_VERSION.
__ANDROID_API_FUTURE__ will be used as before if the version is a
CODENAME.

If BOARD_VNDK_VERSION is not "current", that means the VNDK version
of the vendor modules is BOARD_VNDK_VERSION.

Bug: 74833244
Test: Build and check boot.
Change-Id: I383c76a36101e39c70575b463880b52d3e9d90bb

cc/cc.go

@@ -502,10 +502,17 @@ func (ctx *moduleContextImpl) useSdk() bool {
 func (ctx *moduleContextImpl) sdkVersion() string {
 	if ctx.ctx.Device() {
 		if ctx.useVndk() {
-			return "current"
-		} else {
-			return String(ctx.mod.Properties.Sdk_version)
+			vndk_ver := ctx.ctx.DeviceConfig().VndkVersion()
+			if vndk_ver  == "current" {
+				platform_vndk_ver := ctx.ctx.DeviceConfig().PlatformVndkVersion()
+				if inList(platform_vndk_ver, ctx.ctx.Config().PlatformVersionCombinedCodenames()) {
+					return "current"
+				}
+				return platform_vndk_ver
+			}
+			return vndk_ver
 		}
+		return String(ctx.mod.Properties.Sdk_version)
 	}
 	return ""
 }