pinctrl: sh-pfc: Improve PINMUX_IPSR_PHYS() documentation

- The IPSR field is meant for documentation only,
  - The function name refers to the pin function, not to the IPSR
    field.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

drivers/pinctrl/sh-pfc/sh_pfc.h

@@ -418,8 +418,8 @@ extern const struct sh_pfc_soc_info shx3_pinmux_info;
 /*
  * Describe a pinmux configuration in which a pin is physically multiplexed
  * with other pins.
- *   - ipsr: IPSR field
- *   - fn: Function name, also referring to the IPSR field
+ *   - ipsr: IPSR field (unused, for documentation purposes only)
+ *   - fn: Function name
  *   - psel: Physical multiplexing selector
  */
 #define PINMUX_IPSR_PHYS(ipsr, fn, psel) \