samples: net: zperf: add imx95 evk a55 suppport

Add i.MX 95 EVK A55 support for zperf sample.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>

samples/net/zperf/boards/imx95_evk_mimx9596_a55.conf

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+# The GICv3 & ITS drivers allocation needs are:
+# - LPI prop table: global 1x64K aligned on 64K
+# - LPI pend table: for each redistributor/cpu 1x64K aligned on 64K
+# - Devices table: 128x4K aligned on 4K
+# - Interrupt Collections table: 1x4K aligned on 4K
+#
+# This makes 11x64K to permit all allocations to success.
+#
+# Note, will need 64K HEAP_MEM per CPUs added.
+#
+# This doesn't necessarily include the Interrupt Translation Table, which are
+# 256bytes aligned tables, for reference a 32 ITEs table needs 256bytes.
+#
+# To permit allocating 256 ITT tables of 32 ITEs, 13x64K HEAP_MEM is needed
+CONFIG_HEAP_MEM_POOL_SIZE=851968