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/at91sam9261ek_nandflash_defconfig b/configs/at91sam9261ek_nandflash_defconfig
index f8690f9..b80d5a6 100644
--- a/configs/at91sam9261ek_nandflash_defconfig
+++ b/configs/at91sam9261ek_nandflash_defconfig
@@ -24,6 +24,7 @@
 CONFIG_BOOTCOMMAND="nand read 0x22000000 0x200000 0x300000; bootm"
 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