misc: pch_phub: Drop two unused functions

misc: pch_phub: Drop two unused functions

The two functions are unused since commit 34afa1d657d4
("misc/pch_phub.c: use generic power management") but the compiler
didn't warn about it because the same commit marked the functions as
__maybe_unsed.

Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/aaa24e2dbb2be5fb2dffa61c89fc190aaa391ad0.1779360001.git.u.kleine-koenig@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>