msm: tspp: fix alignment fault

Driver initializes some data structures which reside in TSPP
registers using 'memset()'. This can cause alignment faults
on some platforms (such as msm8994 which is 64bit).
Instead, driver should use 'memset_io()' for memory which is
io mapped.

Change-Id: I58fe0e71d3a930293627f7495d324dcc1b98a4aa
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>