Comments modification: PS_ON to FX2_PS_EN and PROG_B (or PROG) to FX2_PROG_B

Comments modification: PS_ON to FX2_PS_EN and PROG_B (or PROG) to
FX2_PROG_B.
Reason of this modification: to use the same names of TE0300, TE0320 and
TE0630 schematics.