clover: Fix host access validation for sub-buffer creation

clover: Fix host access validation for sub-buffer creation

  From CL 1.2 Section 5.2.1:
    CL_INVALID_VALUE if buffer was created with CL_MEM_HOST_WRITE_ONLY and
    flags specify CL_MEM_HOST_READ_ONLY , or if buffer was created with
    CL_MEM_HOST_READ_ONLY and flags specify CL_MEM_HOST_WRITE_ONLY , or if
    buffer was created with CL_MEM_HOST_NO_ACCESS and flags specify
    CL_MEM_HOST_READ_ONLY or CL_MEM_HOST_WRITE_ONLY .

Fixes CL 1.2 CTS test/api get_buffer_info

v2: Correct host_access_flags check (Francisco)

Signed-off-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>