dt-bindings: arm: ti: Rearrange IOPAD macros alphabetically

Rearrange SOC specific IOPAD macros alphabetically, so that its easier
to read. No functional change intended.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Tested-by: Devarsh Thakkar <devarsht@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220901141328.899100-2-vigneshr@ti.com