mpc5200, digsy_mtc: add support for rev5 board version

difference to previous board version:
- M29W128GH flash from Numonyx
- SDRAM ISSI IS45S16800 (Option A2 105°C)
- rev5 uses RTC RV-3029-C2
- update cs0 and cs1 baseaddr and length
  depending on the detected flash size.
- added Werner Pfister <Pfister_Werner@intercontrol.de>
  as maintainer for the digsy board variants
- As the M29W128GH needs a special flash_cmd_reset()
  document that in the new file doc/README.cfi.
- move "#endif /* CONFIG_CMD_IDE */" to the right place
- remove LOWBOOT config option for digsy_mtc and digsy_mtc_rev5
  boards
- change doc/README.cfi as Stefan Roese suggested

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
cc: Wolfgang Denk <hs@denx.de>
cc: Stefan Roese <sr@denx.de>
cc: Werner Pfister <Pfister_Werner@intercontrol.de>
cc: Detlev Zundel <dzu@denx.de>
diff --git a/boards.cfg b/boards.cfg
index 54ed0f7..054bfc7 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -239,8 +239,9 @@
 canmb                        powerpc     mpc5xxx
 cm5200                       powerpc     mpc5xxx
 digsy_mtc                    powerpc     mpc5xxx     digsy_mtc
-digsy_mtc_LOWBOOT            powerpc     mpc5xxx     digsy_mtc           -              -           digsy_mtc:SYS_TEXT_BASE=0xFF000000
 digsy_mtc_RAMBOOT            powerpc     mpc5xxx     digsy_mtc           -              -           digsy_mtc:SYS_TEXT_BASE=0x00100000
+digsy_mtc_rev5               powerpc     mpc5xxx     digsy_mtc           -              -           digsy_mtc:DIGSY_REV5
+digsy_mtc_rev5_RAMBOOT       powerpc     mpc5xxx     digsy_mtc           -              -           digsy_mtc:SYS_TEXT_BASE=0x00100000,DIGSY_REV5
 galaxy5200                   powerpc     mpc5xxx     galaxy5200          -              -           galaxy5200:galaxy5200
 galaxy5200_LOWBOOT           powerpc     mpc5xxx     galaxy5200          -              -           galaxy5200:galaxy5200_LOWBOOT
 icecube_5200                 powerpc     mpc5xxx     icecube             -              -           IceCube