drm/xe/irq: allocate all possible msix interrupts

If platform supports MSIX, driver needs to allocate all possible
interrupts.

v2:
  - drop msix_cap and use the api return code instead.
  - fix commit message.

v3:
  - pass specific type in irq flags.

Cc: Ohad Sharabi <osharabi@habana.ai>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Dani Liberman <dliberman@habana.ai>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240124075058.2302235-1-dliberman@habana.ai