drm/i915/gt: optimize the ccs_sz calculation per chunk

Calculate the ccs_sz that needs to be emitted based on the src
and dst pages emitted per chunk. And handle the return value of emit_pte
for the ccs pages.

v2:
  ccs_sz moved to the reduced scope [Matt]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220502142618.2704-3-ramalingam.c@intel.com