Staging: hv: vmbus: Use the DSDT specified irq for vmbus

DSDT specifies the irq value for the vmbus driver; use it unconditionally.
This is an exclusive interrupt line dedicated for the vmbus driver.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>