mailbox: qcom-ipcc: remove stray disable_irq_wake() call

Commit afaf2ba5b430 ("mailbox: qcom-ipcc: Support interrupt wake up
from suspend") replaced enable_irq_wake() with IRQF_NO_SUSPEND on the
IRQ request, but left the paired disable_irq_wake() in remove()
behind.

disable_irq_wake() decrements the IRQ's wake_depth. With no matching
enable_irq_wake() left to increment it, wake_depth stays at 0 and
irq_set_irq_wake() reports:

  WARN(1, "Unbalanced IRQ %d wake disable\n", irq)

on every unbind. Since there is no enable_irq_wake() to pair it with,
remove the stray disable_irq_wake() call; IRQF_NO_SUSPEND already
provides the intended wake behaviour.

Fixes: afaf2ba5b430 ("mailbox: qcom-ipcc: Support interrupt wake up from suspend")
Signed-off-by: Anup Vishwakarma <anup.vishwakarma@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>