linux-firmware: split qcm6490 ZAP shader to separate package

linux-firmware: split qcm6490 ZAP shader to separate package

Adreno zap.mbn files are platform-specific. As such they shouldn't be a
part of the generic ${PN}-qcom-adreno-aNNN packages. Move it to the
${PN}-qcom-qcm6490-adreno package.

Fixes: 6026fdda9021 ("linux-firmware: add new fw file to ${PN}-qcom-adreno-a660")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>