[BUG: 1349] userspace/wrsw_hal: create shmem before locking the SoftPLL

Hal creates shmem before waiting for SoftPLL to lock. By this other programs
waiting for HAL's shmem can start.
Please note that after this fix PPSi does not create shmem before lock.
It waits for HALs minipc server to be ready.

Before shmem is created, read hal mode first.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>