net: pse-pd: Kconfig: Add missing Regulator API dependency

The PSE (Power Sourcing Equipment) API now relies on the Regulator API.
However, the Regulator dependency was missing from Kconfig. This patch
adds the necessary dependency, resolving the issue of the missing
dependency and ensuring proper functionality of the PSE API.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202404201020.mqX2IOu7-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202404200036.D8ap1Mf5-lkp@intel.com/
Fixes: d83e137 ("net: pse-pd: Use regulator framework within PSE framework")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://lore.kernel.org/r/20240423-fix_poe-v3-3-e50f32f5fa59@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/pse-pd/Kconfig

@@ -5,6 +5,7 @@
 
 menuconfig PSE_CONTROLLER
 	bool "Ethernet Power Sourcing Equipment Support"
+	depends on REGULATOR
 	help
 	  Generic Power Sourcing Equipment Controller support.
 
@@ -14,7 +15,6 @@ if PSE_CONTROLLER
 
 config PSE_REGULATOR
 	tristate "Regulator based PSE controller"
-	depends on REGULATOR || COMPILE_TEST
 	help
 	  This module provides support for simple regulator based Ethernet Power
 	  Sourcing Equipment without automatic classification support. For