ARM: dts: keystone: k2l: Fix chip selects for SPI devices

There are 5 chip selects per SPI0 and SPI2 and 3 per SPI1. SPI2 needs
to be pinned out to use and by default they are disabled. So keep the
state disabled to reflect default.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>