Revert "clk: fixed-rate: add devm_clk_hw_register_fixed_rate"

This reverts commit 764b78b9.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: If12736ba2358ad17e36a3e3461aa19d10edd0ba7
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>