arm64: dts: ti: k3-am62a-phycore-som: Add 1.4GHz opp entry

arm64: dts: ti: k3-am62a-phycore-som: Add 1.4GHz opp entry

The phyCORE-AM62Ax is capable of supplying 0v85 to the VDD_CORE
which allows the Cortex-A53s to operate at 1.4GHz according to chapter
7.5 of the SoC's data sheet[0]. Append the 1.4Ghz entry to the OPP table
to enable this OPP

[0] https://www.ti.com/lit/ds/symlink/am62a3.pdf

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://lore.kernel.org/r/20250805090021.1407753-2-w.egorov@phytec.de
Signed-off-by: Nishanth Menon <nm@ti.com>