sunxi: Convert CONFIG_SATAPWR to Kconfig

Convert the CONFIG_SATAPWR into kconfig.
Thanks to that, many SYS_EXTRA_OPTIONS can be removed from some
defconfigs.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index a667c9e..aa6b84b 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -706,6 +706,13 @@
 
 endchoice
 
+config SATAPWR
+	string "SATA power pin"
+	default ""
+	help
+	  Set the pins used to power the SATA. This takes a string in the
+	  format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of
+	  port H.
 
 config GMAC_TX_DELAY
 	int "GMAC Transmit Clock Delay Chain"