phy: ti-pipe3: fix missing bit-wise or operator when assigning val

There seems to be a missing bit-wise or operator when setting val,
fix this by adding it in.

Fixes: 2796ceb0 ("phy: ti-pipe3: Update pcie phy settings")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>