msm: ipa3: Fix to changes the ring variable type

With u16 variable not fitting the higher ring size. So
adding changes to chnage ring type to u32.

Change-Id: Ib16e2426071c642f7e25beb022661dfa914cd0c4
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>