phy: rockchip: naneng-combphy: Add support for multiple resets

Some variants of the PHY have more than just one reset.
To cover all cases, request the rests in bulk rather than just
the reset at index 0.

Co-developed-by: Ren Jianing <jianing.ren@rock-chips.com>
Signed-off-by: Ren Jianing <jianing.ren@rock-chips.com>
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>