ARM: dts: lpc32xx: add clock properties to spi nodes

The change adds clock properties to spi peripheral devices,
clock ids are taken from dt-bindings/clock/lpc32xx-clock.h

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