external/wakaama : fix bug parsing int64_t type
external/wakaama : fix bug parsing int64_t type

This commit fixes an unresolved wakaama server issue.
When executing to create client resource, returns error
COAP_400_BAD_REQUEST. To solve this problem, It's necessary to change
the input data type to 64 bits.

Change-Id: I5715093293c23b563e119641399f4b0a1fe97613
Signed-off-by: Seongeun Choi <ce57d146867da55caaecfb63d001966c99394631@samsung.com>

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