drm/msm: add SDE IRQ domain before creating DRM objects

Currently all connectors list SDE as their parent interrupt
controller.

With commit <f5dd86c92d63df7a2790149d1cb9588c004695b0>
(<drm/msm/sde: reorganize top level interrupt handling code>),
the SDE IRQ domains get added after DRM init functions of the
connectors. This is incorrect as the irq request calls of the
connectors shall fail if the domain of the parent is not added yet.
Fix this by re-ordering the sde_kms_int() function to reflect the
correct order and remove the IRQ domain addition from irq_preinstall
calls as that will be very late for the connectors.

Change-Id: Ie1364840e2f018361e54470516d48c3facf59272
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>