[CSRSRV/BASESRV/CONSRV/WINSRV]

[CSRSRV/BASESRV/CONSRV/WINSRV]
- Add a useful CHECK_API_MSG_SIZE macro to check whether a server message structure can hold in a CSR_API_MESSAGE structure. These checks are required because LPC will use the generic CSR_API_MESSAGE structure for communicating all the different servers' messages, and thus we avoid possible buffer overflows with this method.
- Effectively use this macro for all the server message structures.
- Remove a hack regarding the maximum data size we can pass through the CSR LPC port.
- Remove the now unused CSRSS_HEADER_SIZE symbol.

svn path=/branches/ros-csrss/; revision=57810