drm/amd/display: Fix dc_is_fp_enabled name mismatch

drm/amd/display: Fix dc_is_fp_enabled name mismatch

Fix incorrect function name in comment to match dc_is_fp_enabled.

This function checks if FPU is currently active by reading a counter.
The FPU helpers manage safe usage of FPU in the kernel by tracking when
it starts and stops, avoiding misuse or crashes.

Fixes: 3539437f354b ("drm/amd/display: Move FPU Guards From DML To DC - Part 1")
Cc: Roman Li <roman.li@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Tom Chung <chiahsuan.chung@amd.com>
Cc: Dillon Varone <dillon.varone@amd.com>
Cc: Rafal Ostrowski <rafal.ostrowski@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>