Fix compilation warning/error in setprop_inplace.c

When compiling the current code-base with gcc 4.6.1, the following warning
is raised, which is interpreted as an error:

cc1: warnings being treated as errors
tests/setprop_inplace.c: In function ‘main’:
tests/setprop_inplace.c:62: error: format ‘%016llx’ expects type ‘long long unsigned int’, but argument 2 has type ‘uint64_t’
tests/setprop_inplace.c:68: error: format ‘%016llx’ expects type ‘long long unsigned int’, but argument 2 has type ‘uint64_t’

Use printf format specifiers from <inttypes.h> to solve this.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>