Convert CONFIG_PHY_RESET_DELAY to Kconfig

This converts the following to Kconfig:
   CONFIG_PHY_RESET_DELAY

Cc: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 74339a2..eed6eb1 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -330,3 +330,11 @@
 	depends on DM_ETH
 
 endif #PHYLIB
+
+config PHY_RESET_DELAY
+	int "Extra delay after reset before MII register access"
+	default 0
+	help
+	  Some PHYs need extra delay after reset before any MII register access
+	  is possible.  For such PHY, set this option to the usec delay
+	  required.