misc: make CONFIG_IRQ selectable for all platforms

UCLASS_IRQ driver is not Intel specific. Make CONFIG_IRQ
selectable for all platforms.

Signed-off-by: Wasim Khan <wasim.khan@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>