tty: serial: meson: Fix the compile link error reported by kernel test robot

Describes the calculation of the UART baud rate clock using a clock
frame. Forgot to add in Kconfig kernel test Robot compilation error
due to COMMON_CLK dependency.

Fixes: 44023b8e ("tty: serial: meson: Describes the calculation of the UART baud rate clock using a clock frame")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Yu Tu <yu.tu@amlogic.com>
Link: https://lore.kernel.org/r/20220228064910.11636-1-yu.tu@amlogic.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>