ARM: dts: msm: Remap the sdxpoorwills err fatal gpio

The GPIO for the modem error fatal line is changed from
24 to 20, as per the new configuration. Hence, remapping the
corresponding GPIO to the appropriate pin.

Change-Id: Icd31f0c23d4964f4c22ea0f2c8f9650839c078f9
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>