spdk-top: Increase number of CPU cores supported to 1024

This patch increases the number of cores supported by spdk-top to 1024
to support systems with more lcores.

Not using SPDK_CONFIG_MAX_LCORES so spdk-top can be used independently on a different system
and connect over network instead of RPC.

Fixes: #3425

Change-Id: I00b4412301447ae539012263e9323dbf63e5bc6a
Signed-off-by: Michael Piszczek <mpiszczek@ddn.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/24006


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <jim.harris@samsung.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>