[ARM] pxa: fix ULPI_{DIR,NXT,STP} MFP defines

[ARM] pxa: fix ULPI_{DIR,NXT,STP} MFP defines

Attepmpt to configure ULPI pins gives the following compile error:
  CC      arch/arm/mach-pxa/cm-x300.o
  arch/arm/mach-pxa/cm-x300.c:155: error: 'MFP_MFP_AF0' undeclared here (not in a function)
  arch/arm/mach-pxa/cm-x300.c:155: error: 'MFP_MFP_DS01X' undeclared here (not in a function)
  make[2]: *** [arch/arm/mach-pxa/cm-x300.o] Error 1
  make[1]: *** [arch/arm/mach-pxa] Error 2
  make: *** [sub-make] Error 2

Fix it.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>