Fix 32-bit dmabuf_dump build

Fixes:
system/core/libmeminfo/libdmabufinfo/tools/dmabuf_dump.cpp:109:39: error: format specifies type 'unsigned long' but the argument has type 'uint64_t' (aka 'unsigned long long') [-Werror,-Wformat]

Test: lunch aosp_arm-eng && m dmabuf_dump
Change-Id: Ie605d9b94f5eff888f6a64801512216253a6babb