arm64: ti: dts: move 1.4GHZ OPP table to k3-am625

Move the OPP Table entry for 1.4GHz from am62x-sk-common to am625-sk DT
because it's not a common property across all sk variants of am62x

Suggested-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>