sunxi: Convert CONFIG_MACPWR to Kconfig

Convert the CONFIG_MACPWR to Kconfig and update all the sunxi defconfigs
that used it in SYS_EXTRA_OPTIONS.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/configs/Mele_A1000_defconfig b/configs/Mele_A1000_defconfig
index 4bd81a2..0442360 100644
--- a/configs/Mele_A1000_defconfig
+++ b/configs/Mele_A1000_defconfig
@@ -1,12 +1,12 @@
 CONFIG_ARM=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_MACH_SUN4I=y
+CONFIG_MACPWR="PH15"
 CONFIG_VIDEO_VGA=y
 CONFIG_VIDEO_COMPOSITE=y
 CONFIG_DEFAULT_DEVICE_TREE="sun4i-a10-a1000"
 CONFIG_AHCI=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SYS_EXTRA_OPTIONS="MACPWR=SUNXI_GPH(15)"
 CONFIG_SPL=y
 CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_CMD_IMLS is not set