crypto: qce: Defer probing if BAM dma channel is not yet initialized

Since the Qualcomm qce crypto driver needs the BAM dma driver to be
setup first (to allow crypto operations), it makes sense to defer
the qce crypto driver probing in case the BAM dma driver is not yet
probed.

Move the code leg requesting dma channels earlier in the
probe() flow. This fixes the qce probe failure issues when both qce
and BMA dma are compiled as static part of the kernel.

Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>