pinctrl: renesas: r8a779g0: Fix TCLK suffixes

The Pin Multiplex attachment in Rev.1.10 of the R-Car V4H Series
Hardware User's Manual still has two alternate pins named both TCLK3
and TCLK4.  To differentiate, the pin control driver uses "TCLK[34]" and
"TCLK[34]_X".  In addition, there are alternate pins without suffix, and
with an "_A" or "_B" suffix.

Increase uniformity by adopting R-Car V4M naming:
  - Rename "TCLK2_B" to "TCLK2_C",
  - Rename "TCLK[12]_A" to "TCLK[12]_B",
  - Rename "TCLK[12]" to "TCLK[12]_A",
  - Rename "TCLK[34]_A" to "TCLK[34]_C",
  - Rename "TCLK[34]_X" to "TCLK[34]_A",
  - Rename "TCLK[34]" to "TCLK[34]_B".

Fixes: ad9bb2fe ("pinctrl: renesas: Initial R8A779G0 (R-Car V4H) PFC support")
Fixes: 0df46188 ("pinctrl: renesas: r8a779g0: Add missing TCLKx_A/TCLKx_B/TCLKx_X")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/2845ff1f8fe1fd8d23d2f307ad5e8eb8243da608.1717754960.git.geert+renesas@glider.be