haven: irq_lend: Use Linux IRQ numbers

Users of irq_lend must always translate their Linux IRQ number to HW IRQ
number. Instead, move this common logic into hh_irq_lend and
hh_irq_accept to do the required translation.

Change-Id: Ib43e7f32eb20d3236ff594effda3894eaa115fae
Signed-off-by: Elliot Berman <eberman@codeaurora.org>