net: nvethernet: Use conftest for Linux v6.6

In Linux v6.6, the header net/page_pool.h was split into two headers;
net/page_pool/helper.h and net/page_pool/types.h. Use the conftest
script to detect which of these headers are present and generate compile
time definitions for including the appropriate headers.

Bug 4346767

Change-Id: I389ce5b867a1efd867b8392bb21383784c1b4af6
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3026553
(cherry picked from commit cd4dce2c20)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3028310
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/net/ethernet/nvidia/nvethernet/ether_linux.h

@@ -4,6 +4,8 @@
 #ifndef ETHER_LINUX_H
 #define ETHER_LINUX_H
 
+#include <nvidia/conftest.h>
+
 #include <linux/platform/tegra/ptp-notifier.h>
 #include <linux/ptp_clock_kernel.h>
 #include <linux/pinctrl/consumer.h>
@@ -37,11 +39,11 @@
 #include <soc/tegra/virt/hv-ivc.h>
 #include <soc/tegra/fuse.h>
 #if IS_ENABLED(CONFIG_PAGE_POOL)
-#if defined(NV_SPLIT_PAGE_POOL_HEADER)
+#if defined(NV_NET_PAGE_POOL_H_PRESENT)
+#include <net/page_pool.h>
+#else
 #include <net/page_pool/types.h>
 #include <net/page_pool/helpers.h>
-#else
-#include <net/page_pool.h>
 #endif
 #define ETHER_PAGE_POOL
 #endif