msm: ipa4: Fix to change the header address to u64

Because of using u32 header address in 64 bit targets losing
MSB 32-bit address. Updated the header address variable from u32 to u64.

Change-Id: I26c88e4ebd86a441a02fc2fd93f8168eebf7aff4
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>