soc: sunxi: SUN20I_PPU should depend on PM

An $ARCH or a platform should select PM. Single device drivers
should only depend on PM, not select it.

Having SUN20I_PPU depend on PM removes a kconfig warning:

WARNING: unmet direct dependencies detected for PM
  Depends on [n]: !MMU [=y]
  Selected by [y]:
  - SUN20I_PPU [=y] && (ARCH_SUNXI || COMPILE_TEST [=y])

Fixes: 0ad2185 ("soc: sunxi: select CONFIG_PM")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Chen-Yu Tsai <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Cc: Samuel Holland <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Arnd Bergmann <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

Author: rddunlap

drivers/soc/sunxi/Kconfig

@@ -23,7 +23,7 @@ config SUNXI_SRAM
 config SUN20I_PPU
 	bool "Allwinner D1 PPU power domain driver"
 	depends on ARCH_SUNXI || COMPILE_TEST
-	select PM
+	depends on PM
 	select PM_GENERIC_DOMAINS
 	help
 	  Say y to enable the PPU power domain driver. This saves power