tools: fix setup with built-in kernel modules
tools: fix setup with built-in kernel modules

probe the kernel module existence through /sys/module/ to make it work
with both module and inbuilt kernel module

Signed-off-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk