drm/i915/gt: Fix build error without CONFIG_PM

drm/i915/gt: Fix build error without CONFIG_PM

drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c: In function ‘act_freq_mhz_show’:
drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c:276:20: error: implicit declaration of function ‘sysfs_gt_attribute_r_max_func’ [-Werror=implicit-function-declaration]
  276 |  u32 actual_freq = sysfs_gt_attribute_r_max_func(dev, attr,
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Move sysfs_gt_attribute_* macros out of #ifdef block to fix this.

Fixes: 56a709cf7746 ("drm/i915/gt: Create per-tile RPS sysfs interfaces")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220506032652.1856-1-yuehaibing@huawei.com