boards: mimxrt1060_evk: Added SPI support for RT1060

SPI support is available on LPSPI1 and LPSPI3. Both of these require
board modifications to expose headers. LPSPI1 is used for testing,
and requires that the board have solder jumpers R278, R279, R280,
and R281 bridged.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>