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/configs/netgear_dgnd3700v2_ram_defconfig b/configs/netgear_dgnd3700v2_ram_defconfig
index c3e626c..8649f0e 100644
--- a/configs/netgear_dgnd3700v2_ram_defconfig
+++ b/configs/netgear_dgnd3700v2_ram_defconfig
@@ -47,6 +47,7 @@
 CONFIG_LED_BCM6328=y
 CONFIG_LED_BLINK=y
 CONFIG_LED_GPIO=y
+CONFIG_PHY_RESET_DELAY=20
 CONFIG_DM_ETH=y
 CONFIG_PHY_GIGE=y
 CONFIG_BCM6368_ETH=y