debuggerd: Fix missing include.

The structure user_vfp is incorrectly defined in bionic/libc/kernel/arch-arm/asm/ptrace.h
at the moment, while it should be under bionic/libc/kernel/arch-arm/asm/user.h instead.

Before moving its definition in the corresponding source files, we need to fix its users.
It happens that debuggerd is the only one for now, so fix this by including <linux/user.h>
instead (which will include <asm/user.h> and <asm/ptrace.h>).

Also, make the debug output less chatty by specifying all symbols to be listed
through XLOG2 instead of XLOG.

Change-Id: I16e0fa700945d86efd44ee885a84ad609c0a9b58
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
index 0682b85..45e2067 100644
--- a/debuggerd/utility.h
+++ b/debuggerd/utility.h
@@ -57,10 +57,19 @@
 extern void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...);
 
 #define LOG(fmt...) _LOG(-1, 0, fmt)
+
+/* Set to 1 for normal debug traces */
 #if 0
 #define XLOG(fmt...) _LOG(-1, 0, fmt)
 #else
 #define XLOG(fmt...) do {} while(0)
 #endif
 
+/* Set to 1 for chatty debug traces. Includes all resolved dynamic symbols */
+#if 0
+#define XLOG2(fmt...) _LOG(-1, 0, fmt)
+#else
+#define XLOG2(fmt...) do {} while(0)
+#endif
+
 #endif