Revert "device property: Allow const parameter to dev_fwnode()"

This reverts commit 29cb1657 which is
commit b295d484 upstream.

It makes dev_fwnode() an inline function, when the Android abi seems to
want it around because so many external modules rely on it.  So revert
this change for now.  If it's needed in the future, it can come back in
an abi-safe way.

Bug: 161946584
Change-Id: I498bedf1e6e30477b25efa9577dcaf79e091b3e9
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>