This patch adds missing TCLKx_A/TCLKx_B/TCLKx_X.

Because Document (Rev.0.51) has 2x TCLK3/TCLK4 with no suffix (_A, _B),
this patch names them as _X.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/871qv5txvt.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>