arm64: dts: qcom: sa8775p: Use valid node names for GPI DMAs

arm64: dts: qcom: sa8775p: Use valid node names for GPI DMAs

As pointed out by Intel's robot, the node name doesn't adhere to
dt-bindings.

Fix errors like this one:

qcs9100-ride.dtb: qcom,gpi-dma@800000: $nodename:0: 'qcom,gpi-dma@800000' does not match '^dma-controller(@.*)?$'

Fixes: 34d17ccb5db8 ("arm64: dts: qcom: sa8775p: Add GPI configuration")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202411080206.vFLRjIBZ-lkp@intel.com/
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241107-topic-sa8775_dma-v1-1-eb633e07b007@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>