rust: pin-init: merge `__pinned_init` and `__init`

These functions have the same requirements and are also required to execute
the same code. Prevent duplication by merging them to the single function
and document the additional relaxation of `Init::__init` on both the merged
function and the safety requirement of `Init`.

The existing `__pinned_init` function is deprecated and kept for
compatibility for existing users. For `cfg(kernel)`, it is soft-deprecated
for now and will be removed when all users are migrated.

Link: https://patch.msgid.link/20260729-merge-init-v2-2-26adf47109e7@garyguo.net
Signed-off-by: Gary Guo <gary@garyguo.net>

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