Convert CONFIG_RESET_PHY_R to Kconfig

This converts the following to Kconfig:
   CONFIG_RESET_PHY_R

Cc: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/at91sam9g10ek_dataflash_cs0_defconfig b/configs/at91sam9g10ek_dataflash_cs0_defconfig
index a1e0730..60cb4dc 100644
--- a/configs/at91sam9g10ek_dataflash_cs0_defconfig
+++ b/configs/at91sam9g10ek_dataflash_cs0_defconfig
@@ -26,6 +26,7 @@
 CONFIG_BOOTCOMMAND="sf probe 0; sf read 0x22000000 0x84000 0x294000; bootm 0x22000000"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_RESET_PHY_R=y
 CONFIG_SYS_PROMPT="U-Boot> "
 # CONFIG_CMD_BDI is not set
 # CONFIG_CMD_IMI is not set