Below signature is seen on sdxpinn when HOST reads IPA TX
doorbell address, which leads to HLOS crash.
Internal error: synchronous external abort: 96000010
Indeed IPA TX doorbell address is write-only. Behaviors
on such read access violation is arch-dependent. On
certains platforms, such violation is ignored but read
returns 0.
Hence remove the read access to IPA TX doorbell address
in hal_srng_dst_init_hp() to avoid arch-dependent
behavior.
Change-Id: I3486cd81741922e697e2b3d307db3209b710aa6a
CRs-Fixed: 3339302
a606a71b1e