ARM: dts: lpc32xx: disabled ssp0/spi1 & ssp1/spi2 by default

The SSP0/SPI1 and SSP1/SPI2 shared pinout and should be disable by
default.

Board specific dts should enable them, as needed.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>