UBUNTU: SAUCE: cxlflash: Preserve number of interrupts for master contexts

UBUNTU: SAUCE: cxlflash: Preserve number of interrupts for master contexts

BugLink: http://bugs.launchpad.net/bugs/1752672
The number of interrupts requested for user contexts are stored in the
context specific structures and utilized to manage the interrupts. For the
master contexts, this number is only used once and therefore not saved.

To prepare for future commits where the number of interrupts will be
required in more than one place, preserve the value in the master context
structure.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>