mimxrt1060_evk: mimxrt1064_evk: Enable pyocd runner

Enables the pyocd runner on mimxrt1060_evk and mimxrt1064_evk boards
using the generic cortex_m target. Note that this target is not capable
of programming flash, therefore can only load an application to internal
SRAM (set CONFIG_CODE_ITCM=y and CONFIG_DATA_DTCM=y) or attach to an
application already programmed to flash by other means (e.g., DAPLink
drag-and-drop).

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>