[PATCH] cpm_uart: Made non-console uart work

Kumar, Pantelis,

This patch makes non-console UART work on both 8xx and 82xx. Various 
issues are resolved:
- removed unnecessary STOP_TX commands in shutdown - no need to 
completely stop CPM TX and reinit BDs each time the port is closing;
- when mem_addr has been allocated via dma_coherent_alloc, virt_to_bus 
on it will not tell the truth in most cases
- SCC UART needs to wait several character times even after all the BDs 
have READY bit cleared
- adds needed board-specific bits for 86xADS

Tested on 8272ADS, 885ADS and 866ADS development boards.
---------------------------------
Signed-off-by:  Vitaly Bordug <redacted>

-- 
Sincerely, 
Vitaly