core: Enable drivers for pineapple

Enable rmnet core and ctl drivers and update the kernel APIs to match
the appropriate kernel.

This change also adds support for the inclusion of the IPA kernel
headers from a non-core kernel location. This is achieved using the
flag KBUILD_REQUIRED_KOS.

Additionally, remove all deprecated code.

CRs-Fixed: 3311558
Change-Id: I9317f53ca8b1a370b6a5eb86734057399aee1d48
Signed-off-by: Subash Abhinov Kasiviswanathan <quic_subashab@quicinc.com>

core/rmnet_handlers.c

@@ -445,7 +445,7 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
 	dev = skb->dev;
 	port = rmnet_get_port(dev);
 	if (unlikely(!port)) {
-		atomic_long_inc(&skb->dev->rx_nohandler);
+		dev_core_stats_rx_nohandler_inc(skb->dev);
 		kfree_skb(skb);
 		goto done;
 	}