core: lib: qcbor: add build configuration for QCBOR library

Add the necessary build configuration for integrating the QCBOR
library. Update to core.mk ensure that the library is included
when CFG_QC

core: lib: qcbor: add build configuration for QCBOR library

Add the necessary build configuration for integrating the QCBOR
library. Update to core.mk ensure that the library is included
when CFG_QCBOR is enabled. A sub.mk file is also added to define
the source files and global include directories for QCBOR.

Signed-off-by: Yuichi Sugiyama <yuichis@ricsec.co.jp>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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