msm: gpio: Re-arrange the write to RAW_STATUS_EN

Move enabling the RAW_STATUS_EN at the very beginning.
Hardware team clarified that it is better to write to
RAW_STATUS_EN before writing to any other INTR_CFG bits
in order to prevent spurious interrupts.
Removing writing to the GPIO_INTR_CFG_SU register for
gpio-v2 and remove modifying any other bits except
INTR_ENABLE in mask/unmask calls as it could cause spurious
interrupts as well.

Change-Id: Ia025b324ee3be8073960eac73899f733336cac4c
CRs-Fixed: 346861
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>