arm64: dts: ti: k3-am642-phyboard-electra-rdk: Fixup reference to phandles array

arm64: dts: ti: k3-am642-phyboard-electra-rdk: Fixup reference to phandles array

When referring to array of phandles, using <> to separate the array
entries is better notation as it makes potential errors with phandle
and cell arguments easier to catch. Fix the outliers to be consistent
with the rest of the usage.

Cc: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20230606182220.3661956-7-nm@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>