* device/include/mcs51/at89s8253.h: new, thanks to Krzysztof Polomka

* device/include/mcs51/at89s8253.h: new, thanks to Krzysztof Polomka
* device/include/mcs51/at89S8252.h: fixed, thanks to Krzysztof Polomka
* device/include/mcs51/c8051f326.h,
* device/include/mcs51/c8051f340.h: new SiLabs mcu's
* device/include/mcs51/c8051f000.h,
* device/include/mcs51/c8051f018.h,
* device/include/mcs51/c8051f020.h: used () with __at, renamed IDLE,STOP to
  PCON_IDLE,PCON_STOP and added sfr16 definitions

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4044 4a8a32a2-be11-0410-ad9d-d568d2c75423