It is not correct to assign the 24MHz clock oscillator to the GPIO
ports.

Fix it by assigning the proper GPIO clocks instead.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Tested-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>