ASoC: msm: audio_ion: rectify parsing error for memory range

Reading the memory range into a non u32 variable was giving
incorrect values. Using a u32 variable to read from dts and
type cast to the required structure.

Change-Id: I8e862d455edc838833dbb10ec3ad01c2ce988bb4
Signed-off-by: Simmi Pateriya <simmip@codeaurora.org>