Revert "Mark libpiex as double_loadable"

This reverts commit c64563c91634c8e6c5fd2dd0b0f67315b30a170f.

Reason for revert: libpiex is no longer used by libmediandk(aosp/915075).
Exempt-From-Owner-Approval: revert
Change-Id: I858a16f7d40613b9c433997bbd7308dcf521427b
diff --git a/Android.bp b/Android.bp
index 083c363..0687b19 100644
--- a/Android.bp
+++ b/Android.bp
@@ -59,7 +59,6 @@
     vndk: {
         enabled: true,
     },
-    double_loadable: true,
     srcs: [
         "src/tiff_parser.cc",
         "src/piex.cc",