arm64: dts: qcom: sm8450: fix UFS PHY registers

The sizes of the UFS PHY register regions are too small and does
specifically not cover all registers used by the Linux driver.

As Linux maps these regions as full pages this is currently not an issue
on Linux, but let's update the sizes to match the vendor driver.

Fixes: 07fa917a ("arm64: dts: qcom: sm8450: add ufs nodes")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>