media: qcom: camss: Add common TPG support

Introduce a new common Test Pattern Generator (TPG) implementation for
Qualcomm CAMSS. This module provides a generic interface for pattern
generation that can be reused by multiple platforms.

Unlike CSID-integrated TPG, this TPG acts as a standalone block
that emulates both CSIPHY and sensor behavior, enabling flexible test
patterns without external hardware.

Signed-off-by: Wenmeng Liu <wenmeng.liu@oss.qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # Dell Inpsiron14p
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>

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