phy: rockchip: snps-pcie3: Fix "rockchip" spelling

Several identifiers use "rochchip" instead of "rockchip".
Fix this by replacing every instance of "rochchip" with "rockchip".

Signed-off-by: Sebastian Kropatsch <seb-dev@mail.de>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>