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/nas220_defconfig b/configs/nas220_defconfig
index f6a1dcb..1227d8d 100644
--- a/configs/nas220_defconfig
+++ b/configs/nas220_defconfig
@@ -17,6 +17,7 @@
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_USE_PREBOOT=y
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_RESET_PHY_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="nas220> "
 # CONFIG_CMD_FLASH is not set