shaders: Add assembler instructions and update README for shaders

We're not planning to work on assembler in igt anymore, since we can
reuse an existing project (IGA) that will do this work for us. The
only extra thing we need to do is convert the result binary to C-array,
simple python script.

v2: Moved converter to single file. Fixed README for shaders.
v3: Fixed typos.
v4: Used python3 in converter. Added 'usage' section to script. Droped
readme files for particular shaders and consolidated all needed
information in one general file.

Signed-off-by: Katarzyna Dec <katarzyna.dec@intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Kalamarz Lukasz <lukasz.kalamarz@intel.com>
Cc: Antonio Argenziano <antonio.argenziano@intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

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