spi: omap2-mcspi: At remove dont use the runtime_autosuspend calls

At remove we shouldnt be using the autosuspend timeout as we are
calling pm_runtime_disable immediately after.

Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>