checkbootreason: power key is long pressed if reboot_reason&1==1

1 is cable plugged out and power key long pressed
97 is cable plugged in power key long pressed
96 is charger (USB&Wall)

0x01 -- keyboard power on
0x02 -- RTC alarm
0x04 -- cable power on
0x08 -- SMPL
0x10 -- Watch Dog timeout
0x20 -- USB charger
0x40 -- Wall charger
0xFF -- error reading power_on_status value

This patch is required:

https://github.com/GenetICS/lge_kernel_msm7x27/commit/3a6e01c3aaff4c59ae44b538af23ec86be962e64

Change-Id: I12ec5d3449f28d5a57783d5a0b5bdb3b7fcdd57c