ahci: imx: fix the error handling in imx_ahci_probe()

Release alloced resources instead of direct return from
imx_ahci_probe() in the error handling case.

Fixes: 4a23d179 ('ahci: imx: Add i.MX53 support')
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Marek Vasut <marex@denx.de>