[platform][zynq] save the reboot status register and clear reason bits
[platform][zynq] save the reboot status register and clear reason bits

Pretty print the reason bits.

srodrig1/lk,sndnvaps/lk,srodrig1/lk,sndnvaps/lk,skabet/lk,nvll/lk,minglun-tsai/lk,travisg/lk,srodrig1/lk,travisg/lk,nvll/lk,sndnvaps/lk,skabet/lk,minglun-tsai/lk,hollanderic/lkstuff,littlekernel/lk,ErikCorryGoogle/lk,GCrean/lk,GCrean/lk,minglun-tsai/lk,sndnvaps/lk,minglun-tsai/lk,ErikCorryGoogle/lk,littlekernel/lk,srodrig1/lk,hollanderic/lkstuff,sndnvaps/lk,skabet/lk,nvll/lk,littlekernel/lk,GCrean/lk,GCrean/lk,skabet/lk,nvll/lk,srodrig1/lk,hollanderic/lkstuff,travisg/lk,littlekernel/lk,nvll/lk,ErikCorryGoogle/lk,skabet/lk,travisg/lk,hollanderic/lkstuff,GCrean/lk,ErikCorryGoogle/lk