move non-HAL definitions to syste/core/include

This patch moves camera- and graphics-related definitions out of the hardware
HAL layer and into system/core.  These definitions are used both by the HAL and
by higher-level code as well.  More functionality (e.g., audio definitions)
will be moved here as well.

Change-Id: I225f12374ce54fa393640dce53738267d0d703e9
Signed-off-by: Iliyan Malchev <malchev@google.com>