clk: renesas: r8a779f0: Fix Ethernet Switch clocks

The RSwitch2 and EtherTSN-IF clocks were accidentally mixed up.
While at it, rename them to better match the (future) documentation.

Fixes: a3b4137a ("clk: renesas: r8a779f0: Add Ethernet Switch clocks")
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/99b8b41bd2c5043c9e457862ef4bc144869eca58.1668501212.git.geert+renesas@glider.be