Do not use the board pdata for irq_base, but allocate them dynamically
to allow a proper support of SPARSE_IRQ.

Fix an unneeded line wrap.
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>
Acked-by: NFelipe Balbi <balbi@ti.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>