drm/amd/display/dc/irq: Remove duplications of hpd_ack function from IRQ

The major of dcn and dce irqs share a copy-pasted collection
of copy-pasted function, which is: hpd_ack.

This patch removes the multiple copy-pasted by moving them to
the irq_service.c and make the irq_service's
calls the functions implemented by the irq_service.c
instead.

The hpd_ack function is replaced by hpd0_ack and hpd1_ack, the
required constants are also added.

The changes were not tested on actual hardware. I am only able
to verify that the changes keep the code compileable and do my
best to look repeatedly if I am not actually changing any code.

Signed-off-by: Sebastian Aguilera Novoa <saguileran@ime.usp.br>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>