i915: Blit RGBX<->RGBA drawpixels

The blitter already has code to accommodate filling in the alpha channel
for BGRX destination formats, so expand this to also allow filling the
alpha channgel in RGBX formats.

More importantly for the next patch is moving the test into its own
function for the purpose of exporting the check to the callers.

v2: Fix alpha expansion as spotted by Alexander with the fix suggested by
Kenneth

Signed-off-by: Chris Wilson <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Cc: Alexander Monakov <[email protected]>
Cc: Kristian Høgsberg <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Reviewed-by Kenneth Graunke <[email protected]>
Cc: [email protected]

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