regmap: Add explicit dependencies to catch "select" misuse

Add explicit dependencies for the various regmap modules, so Kconfig
will print a warning message when another module selects a regmap module
without fulfilling its dependencies.

Without this, it's much more difficult to find out which module did the
offending select.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 4251570..8a3f51f 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -11,12 +11,15 @@
 
 config REGMAP_I2C
 	tristate
+	depends on I2C
 
 config REGMAP_SPI
 	tristate
+	depends on SPI
 
 config REGMAP_SPMI
 	tristate
+	depends on SPMI
 
 config REGMAP_MMIO
 	tristate