[layers/manager] Register weights with manager

[layers/manager] Register weights with manager

All the weights of the layer are now registered with manager
Manager allocates memory for these weights and in future
handle their updates etc

See also #774 #766

**Self evaluation:**
1. Build test: [x]Passed [ ]Failed [ ]Skipped
2. Run test: [x]Passed [ ]Failed [ ]Skipped

Signed-off-by: Parichay Kapoor <pk.kapoor@samsung.com>