drm/msm/adreno: Generate name from chipid for 7c3

Use a gpu name which is sprintf'ed from the chipid for 7c3 gpu instead of
hardcoding one. This helps to avoid code churn in case of a gpu rename.

Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Link: https://lore.kernel.org/r/20220226005021.v2.2.I9436e0e300f76b2e6c34136a0b902e8cfd73e0d6@changeid
Signed-off-by: Rob Clark <robdclark@chromium.org>