staging: most: hdm-dim2: remove clearance of pending MLB interrupt

This patch removes unnecessary clearing of a pending mlb_int from the
service routine for ahb interrupt.

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>