omap4-common: prevent lis3dh from overwriting arbitrary kernel memory

this fixes a use-after-free which was previously "worked-around"
in commit b1fdf107c3432d869fe80da75a60203917d69cea. This actually
made the situation worse.

Change-Id: Ie200de1a255eb0db91d601d56f77fe06cff48460
Revert "moto lis3dh: use i2c block API"

This reverts commit b1fdf107c3432d869fe80da75a60203917d69cea.

This "fix" used to initialize the flags-field in the client-
structure with 0 so the i2c-transfer was successful.
But this was only needed because the client-structure was
a pointer to a structure on the stack of the init-function.
Writing the flags-field actually overwrote random kernel memory
at that location.

Change-Id: I2efbc7776c8c7459c26f5cbaddb90e730580e451