linux-firmware: split platform-specific Adreno shaders to separate packages

For newest Qualcomm platforms the firmware for the Adreno GPU consists
of two parts: platform-independent SQE/GMU/GPMU/PFP/PM4 and
platform-specific ZAP shader, which is used during the boot process. As
the platform-independent parts can be shared between different
platforms, split the platform-specific part to the separate package.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>