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_cg3100d_ram_defconfig b/configs/netgear_cg3100d_ram_defconfig
index b961b58..869d4c8 100644
--- a/configs/netgear_cg3100d_ram_defconfig
+++ b/configs/netgear_cg3100d_ram_defconfig
@@ -45,6 +45,7 @@
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHY_RESET_DELAY=20
 CONFIG_DM_RESET=y
 CONFIG_RESET_BCM6345=y
 CONFIG_DM_SERIAL=y