[OR1K,patch] Fixup UART in libgloss

[Stefan Wallentowitz]

Dear all,

attached patch fixes a bug in the UART driver and contains some code
cleanup/documentation.

Best,
Stefan

libgloss/Changelog:
    * or1k/or1k_uart.c: Write bugfix and cleanup/documentation
    * or1k/or1k_uart.h: Cleanup
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