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/configs/Cubietruck_defconfig b/configs/Cubietruck_defconfig
index 9f2e994..f9d56c8 100644
--- a/configs/Cubietruck_defconfig
+++ b/configs/Cubietruck_defconfig
@@ -7,11 +7,11 @@
 CONFIG_USB0_VBUS_DET="PH22"
 CONFIG_USB0_ID_DET="PH19"
 CONFIG_VIDEO_VGA=y
+CONFIG_SATAPWR="PH12"
 CONFIG_GMAC_TX_DELAY=1
 CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-cubietruck"
 CONFIG_AHCI=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SYS_EXTRA_OPTIONS="SATAPWR=SUNXI_GPH(12)"
 CONFIG_SPL=y
 CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_CMD_IMLS is not set