Fix base clock frequencies for timers 9/10/11 (not currently used).

Thanks to xiazibin@gmail.com for pointing these out.
MPU6000: gyro topic was not initialized
Merge pull request #672 from PX4/hotfix_mpu6000

MPU6000: gyro topic was not initialized
Merge branch 'px4' into alpha
MPU6050: gyro topic was not initialized.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>