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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core: lib: qcbor: add SPDX license identifiers to QCBOR files

Add SPDX license identifiers to QCBOR files as per
BSD-3-Clause licensing requirements, ensuring clear license
information across both h

core: lib: qcbor: add SPDX license identifiers to QCBOR files

Add SPDX license identifiers to QCBOR files as per
BSD-3-Clause licensing requirements, ensuring clear license
information across both header and source files.

Signed-off-by: Yuichi Sugiyama <yuichis@ricsec.co.jp>
Acked-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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core: import QCBOR library

Import QCBOR v1.4.1 from https://github.com/laurencelundblade/QCBOR
Commit 4487f10e1bf258434fb8a39e4f59c29e31910ad0 (tag v1.4.1)

Certain files will never be needed and ar

core: import QCBOR library

Import QCBOR v1.4.1 from https://github.com/laurencelundblade/QCBOR
Commit 4487f10e1bf258434fb8a39e4f59c29e31910ad0 (tag v1.4.1)

Certain files will never be needed and are thus removed (reducing number
of lines to almost 60%):
rm -f CMakeLists.txt Makefile SECURITY.md
rm -f .gitignore
rm -f cmd_line_main.c example.c example.h ub-example.c ub-example.h
rm -rf QCBOR.xcodeproj doc doxygen test
rm -rf .git .github

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

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