soc: nuvoton: Add "select REGMAP" to WPCM450 SoC driver

Select CONFIG_REGMAP from CONFIG_WPCM450_SOC, because the driver relies
on regmap to work.

Reported-by: Geert Uytterhoeven <[email protected]>
Closes: https://lore.kernel.org/lkml/CAMuHMdWo5vHCeE6BeSHrUy12uT7_wFhW-VbQmQ5u+4Q8c7-wYQ@mail.gmail.com/
Fixes: 7dbb4a3 ("soc: nuvoton: Add SoC info driver for WPCM450")
Signed-off-by: Jonathan Neuschäfer <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
---
v5:
- Rebase on v6.6-rc2

v4:
- Add Geert's R-b tag
- Fix commit reference
- Change Link tag to Closes

v3:
- Split the commit into two
- Reword the commit messages a bit

v2:
- https://lore.kernel.org/lkml/[email protected]/
- Commit message improvements, as suggested by Geert Uytterhoeven.
- Add Link after Reviewed-by, as checkpatch.pl now suggests

drivers/soc/nuvoton/Kconfig

@@ -6,6 +6,7 @@ config WPCM450_SOC
 	tristate "Nuvoton WPCM450 SoC driver"
 	default y if ARCH_WPCM450
 	select SOC_BUS
+	select REGMAP
 	help
 	  Say Y here to compile the SoC information driver for Nuvoton
 	  WPCM450 SoCs.