zynqmp: pm: Filter errors related to clock gate permissions

zynqmp: pm: Filter errors related to clock gate permissions

Linux clock framework cannot properly deal with these errors. When the
error is related to the lack of permissions to control the clock we
filter the error and report the success to linux. Before recent changes
in clock framework across the stack, this was done in the PMU-FW as a
workaround. Since the PMU-FW now handles clocks and the permissions to
control them using general principles rather than workarounds, it can
no longer distinguish such exceptions and it has to return no-access
error.

Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Change-Id: I1491a80e472f44e322a542b29a20eb1cb3319802