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/at91sam9m10g45ek_nandflash_defconfig b/configs/at91sam9m10g45ek_nandflash_defconfig
index 99540f8..c595b9e 100644
--- a/configs/at91sam9m10g45ek_nandflash_defconfig
+++ b/configs/at91sam9m10g45ek_nandflash_defconfig
@@ -23,6 +23,7 @@
 CONFIG_BOOTCOMMAND="nand read 0x70000000 0x200000 0x300000;bootm 0x70000000"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_RESET_PHY_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot> "
 # CONFIG_CMD_BDI is not set