JLink V6.44 (2019-03-01) added support for the imx rt1064 soc, including
programming the internal flash on flexspi2. Updates the mimxrt1064_evk
board to use the internal flash and external sdram memories by default,
now that the debug tools support them.
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>