staging: most: hdm-dim2: remove structure member

This patch removes the member irq_ahb0 of the structure dim2_hdm, since
its job is suitably done by a simple auto variable.

Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>