Remove redundant irqchip_init() callback. The default case
of NULL will result in invoking irqchip_init() anyway.
Signed-off-by: Magnus Damm <damm@opensource.se>
[ horms+renesas@verge.net.au: Trimmed patch to remove portion
  that updates the r8a7790 SoC and altered the subject to
  use the same format as the patch that updates the r8a7790. ]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>