clocksource: sh_cmt: Use request_irq() instead of setup_irq()

clocksource: sh_cmt: Use request_irq() instead of setup_irq()

The driver claims it needs to register an interrupt handler too early
for request_irq(). This might have been true in the past, but the only
meaningful difference between request_irq() and setup_irq() today is an
additional kzalloc() call in request_irq(). As the driver calls
kmalloc() itself we know that the slab allocator is available, we can
thus switch to request_irq().

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
(cherry picked from commit dc2eadece70089430f12e4ed6bb1a4421cf3d6f4)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>