irq: Make irq affinity function cpu isolation aware

Prohibit setting the affinity of an IRQ to an isolated core.

Change-Id: I2a2f75250eb410ace1e54772e4807b9fe620041a
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[markivx: Ported to 4.14, fixed conflict with managed irq]
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>