ARM: dts: qcom: sdx55: Fix the address used for PCIe EP local addr space

Fix the address range used for mapping the PCIe host memory in the DDR.

Fixes: ac0e2878cbb0 ("ARM: dts: qcom: sdx55: Add support for PCIe EP")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>