remove NSTopic state in NSCacheTopicSubData.
remove NSTopic state in NSCacheTopicSubData.

NSTopic state variable is not required in NSCacheTopicSubData.

Change-Id: Ifd76a6638604fab432215f7134e08adc051e1d1d
Signed-off-by: jaesick.shin <0c15f419be0b798d814c9433c3dc372b1d1c1c73@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10277
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Madan Lanka <f0ab8ffa6f9be130982d9ec09d220706b52daee1@samsung.com>

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