Bluetooth: samples: Add hexiwear_k64 and frdm_k64f to tests
Bluetooth: samples: Add hexiwear_k64 and frdm_k64f to tests

The introduction of device tree broke bluetooth sample builds for the
hexiwear_k64 and frdm_k64f boards. Add these boards to the peripheral_hr
test so this doesn't happen again.

Jira: ZEP-1745

Change-Id: I3e61a83db09cbb5834bd510bff851611e43844a8
Signed-off-by: Maureen Helm <87a696db5547fa477bda9f9e0f00013c839c14d3@nxp.com>

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