config: enable more than 128 cores for arm64

When running dpdk applications on cores whose ids are bigger
than original max_core setting, eal error as below:
EAL: Detected 104 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: invalid core list
-l CORELIST core indexes between 0 and 128

The fix is to increase max_core to 256 on arm64 platform.

Fixes: b3ce00e5 ("mk: introduce ARMv8 architecture")
Cc: stable@dpdk.org

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>

config/arm/meson.build

@@ -46,6 +46,7 @@ flags_common_default = [
 
 flags_generic = [
 	['RTE_MACHINE', '"armv8a"'],
+	['RTE_MAX_LCORE', 256],
 	['RTE_CACHE_LINE_SIZE', 128]]
 flags_cavium = [
 	['RTE_MACHINE', '"thunderx"'],

config/defconfig_arm64-armv8a-linuxapp-gcc

@@ -6,3 +6,4 @@
 
 CONFIG_RTE_TOOLCHAIN="gcc"
 CONFIG_RTE_TOOLCHAIN_GCC=y
+CONFIG_RTE_MAX_LCORE=256