make libfmq host_supported

Needed to move from INT_MAX to numeric_limits.
Include sys/user.h for PAGE_SIZE definition.
This is preperation for a fuzzer.

Test: atest fmq_test
Test: atest fmq_unit_tests
Bug: 165621851

Change-Id: Id5c92804644fdf5665f2db6fa5dfb2e9d67528c2
diff --git a/Android.bp b/Android.bp
index 97050a1..5889a9c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -58,6 +58,7 @@
     },
     double_loadable: true,
     min_sdk_version: "29",
+    host_supported: true,
 }
 
 // Header only lib to share type between HIDL and AIDL MQDescriptor