samples: net: zperf: Enable i226 config with Intel Alderlake

The Zperf sample application was chosen to demonstrate basic network
functionality and high-performance use cases. This application serves
as a reference for users who wish to enable other network sample
applications.

In addition to the essential configurations for the Intel i226 Ethernet
controller, stack-specific configurations were added to ensure stability
under heavy network loads. These configurations include adjustments to
buffer sizes, interrupt handling, and DMA descriptor management.

This commit has been tested using the Zperf sample application to verify
basic functionality and performance on the i226 platform.

Signed-off-by: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.com>
Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>

Author: Vijayakannan

samples/net/zperf/boards/intel_adl_crb.conf

@@ -0,0 +1,35 @@
+#
+# Ethernet Drivers
+#
+CONFIG_ETH_INTEL_PLAT=y
+CONFIG_ETH_INTEL_IGC=y
+
+#
+# Link layer options
+#
+CONFIG_NET_L2_ETHERNET=y
+
+CONFIG_NET_PKT_RX_COUNT=512
+CONFIG_NET_PKT_TX_COUNT=512
+CONFIG_NET_BUF_RX_COUNT=512
+CONFIG_NET_BUF_TX_COUNT=512
+CONFIG_NET_BUF_DATA_SIZE=1024
+
+#
+# Increase stack usage for stability
+#
+CONFIG_NET_TX_STACK_SIZE=8192
+CONFIG_NET_RX_STACK_SIZE=8192
+CONFIG_NET_TCP_WORKQ_STACK_SIZE=8192
+CONFIG_NET_MGMT_EVENT_STACK_SIZE=8192
+CONFIG_NET_SOCKETS_SERVICE=y
+CONFIG_NET_SOCKETS_SERVICE_STACK_SIZE=8192
+
+#
+# IP stack
+#
+CONFIG_NET_IPV4_FRAGMENT=y
+CONFIG_NET_STATISTICS_ETHERNET=n
+
+# Disable VTD_ICTL until have IOMMU support.
+CONFIG_INTEL_VTD_ICTL=n