omap4-common: don't spam the logfile when changing scaling governors

only log a failed write to the boostpulse_fd once and then retry
opening it, instead of logging the failed write for every touchscreen
interaction.

Change-Id: I8a2d0741819b477ba260a6ac44f3295ba865ab94
Merge remote-tracking branch 'upstream/cm-11.0' into pa4.4