Staging: vme: Clean up tsi148 driver

* Remove message from IACK interrupt handler
* Correct clearing of location monitor interrupts
* Remove interrupt cleanup code that's duplcated in sub function

Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>