Move PHYLIB to Kconfig

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/bcm958300k-ns_defconfig b/configs/bcm958300k-ns_defconfig
index ac50b2e..54f3acb 100644
--- a/configs/bcm958300k-ns_defconfig
+++ b/configs/bcm958300k-ns_defconfig
@@ -18,6 +18,7 @@
 CONFIG_CMD_TIME=y
 CONFIG_CMD_FAT=y
 # CONFIG_MMC is not set
+CONFIG_PHYLIB=y
 CONFIG_SYS_NS16550=y
 CONFIG_SHA1=y
 CONFIG_SHA256=y