hash: fix memory allocation of cuckoo key table

hash: fix memory allocation of cuckoo key table

When calculating the size for the table which allocates
the keys, size was calculated wrongly from multiplying
two 32-bit variables, resulting on a 32-bit number,
before casting to 64-bit, so maximum size was 4G.

Fixes: 48a399119619 ("hash: replace with cuckoo hash implementation")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>