Convert CONFIG_NET_RETRY_COUNT to Kconfig

This converts the following to Kconfig:
   CONFIG_NET_RETRY_COUNT

Cc: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/net/Kconfig b/net/Kconfig
index 683c2ad..2e32b55 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -12,6 +12,13 @@
 	int "Milliseconds before trying ARP again"
 	default 5000
 
+config NET_RETRY_COUNT
+	int "Number of timeouts before giving up"
+	default 5
+	help
+	  This variable defines the number of retries for network operations
+	  like ARP, RARP, TFTP, or BOOTP before giving up the operation.
+
 config PROT_UDP
 	bool "Enable generic udp framework"
 	help