[include][sys][types.h] Change lk_time_t to uint32_t
[include][sys][types.h] Change lk_time_t to uint32_t

Use a fixed size for lk_time_t so the same time conversions can
be used on 64 bit and 32 bit systems.

Change-Id: I92ce900fc6b3d783a7d93a05c2ecf8fb236552ad

srodrig1/lk,minglun-tsai/lk,skabet/lk,GCrean/lk,skabet/lk,sndnvaps/lk,skabet/lk,ErikCorryGoogle/lk,travisg/lk,littlekernel/lk,grub4android/lk,travisg/lk,littlekernel/lk,GCrean/lk,littlekernel/lk,nvll/lk,GCrean/lk,travisg/lk,skabet/lk,littlekernel/lk,nvll/lk,grub4android/lk,srodrig1/lk,ErikCorryGoogle/lk,hollanderic/lkstuff,travisg/lk,ErikCorryGoogle/lk,srodrig1/lk,minglun-tsai/lk,skabet/lk,sndnvaps/lk,grub4android/lk,sndnvaps/lk,hollanderic/lkstuff,srodrig1/lk,hollanderic/lkstuff,grub4android/lk,nvll/lk,GCrean/lk,minglun-tsai/lk,hollanderic/lkstuff,srodrig1/lk,sndnvaps/lk,ErikCorryGoogle/lk,grub4android/lk,nvll/lk,nvll/lk,GCrean/lk,minglun-tsai/lk,sndnvaps/lk