MFD: AB3550 core updated against mainline

This patch aligns the internal 2.6.29 tree with what has been submitted
to mainline for driver ab3550-core. It also adds the abx500 interface
needed by ab3550 and later ab5500.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Change-Id: I76373580a36462dd08cf11daa6b0813ab35a1c52
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/2423
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
6 files changed