hwspinlock: Remove unused (devm_)hwspin_lock_request()

hwspinlock: Remove unused (devm_)hwspin_lock_request()

devm_hwspin_lock_request() was added by 2018's
commit 4f1acd758b08 ("hwspinlock: Add devm_xxx() APIs to request/free
hwlock") however, it's never been used, everyone uses the
devm_hwspin_lock_request_specific() call instead.

Remove it.

Similarly, the none-devm variant isn't used.
Remove it, and the referring documentation.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20241027205445.239108-1-linux@treblig.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>