TCF: especify ARCH when building
TCF: especify ARCH when building

Some test cases and samples require ARCH being specified. In TCF, that
information is carried by the BSP variable.

This is a workaround hack to a historical carry over that should be
removed once the extra work to do so is completed (ZEP-754). Tagged as
such.

Change-Id: I640efce3e65f46473443c5413807cdc7cdfd8be8
Jira: ZEP-760
Signed-off-by: Inaky Perez-Gonzalez <96af2f95d738a33e3cb28686ea74cc090643af9b@intel.com>

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