drm/bridge: tpd12s015: Drop buggy __exit annotation for remove function

In the Linux kernel, the following vulnerability has been resolved:

drm/bridge: tpd12s015: Drop buggy __exit annotation for remove function

With tpd12s015_remove() marked with __exit this function is discarded

when the driver is compiled as a built-in. The result is that when the

driver unbinds there is no cleanup done which results in resource

leakage or worse.