ath9k_hw: MCI whitespace/debug cleanup

This patch fixes indentation and the general coding style
in ar9003_mci.c. Also, minimize the amount of debug log
output generated by MCI.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>