1. Refactored code to use HCC internal APIs rather than HCC copy APIs
2. Added hipMemcpyToSymbolAsync
3. Added test for hipMemcpyToSymbolAsync
4. Added new error hipErrorInvalidSymbol
Change-Id: I0e359b2d0ff5d682bbccdf9c2923e16b35e39497
1. Currently works only for __attribute__((addrspace(1))
2. Need to pass in string for name of the variable
3. Added test to check functionality
Change-Id: I4c3cc1bf151cb5423e4aef59fcc4ad5693b31641