cpufreq: zynq: Remove legacy cpufreq driver fixup

This should be the part of:
"cpufreq: zynq: Remove legacy cpufreq driver"
(sha1: 7007acbc3f417ac1460d004996b4a2f4131fa553)

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>