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

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

Change-Id: I2ee3d78a9bd2aed7be8c6eebbf73094e4e222029
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>