i2c:omap: fix OMAP_I2C_SYS_REG  in reg_map.

Change-Id: Id741b72af3d99761dc1e38032efad7c06c3cf470
Revert "proc: make sure mem_open() doesn't pin the target's memory"

This reverts commit 0053779e04bbfabe31287245d89ad10bb66e758a.
Revert "proc: unify mem_read() and mem_write()"

This reverts commit b49767a65a6454f7d546068a785e25dbb0eabbcd.
Revert "proc: mem_release() should check mm != NULL"

This reverts commit 401f63716ca0bca1728e55ccf2132fb3785cf5da.