MFD: TWL6030: Implementation of the ProDB00112620 errata

This errata affects only TWL6030 ES2.1. The usage of the CIN_LIMIT
codes above 600mA (CHARGERUSB_CINLIMIT Register, codes
650mA/700mA/750mA) may lead to an unlimited input current in
case VBUS < 4.1V.

Workaround: The anti-collapse feature needs to be enabled before
usage of the CIN_LIMIT. All CIN_LIMIT codes will be functional at
all anti-collapse levels.

Change-Id: I4fc0eb64cc96b692f4761a27098df307e1f5cd54
Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@ti.com>

Conflicts:
	drivers/mfd/twl-core.c
	include/linux/i2c/twl.h