drm/inspur: fix compile warning

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I84IWW



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Fix the following warning of inspur BMC drm driver:

drivers/gpu/drm/inspur/inspur_drm_drv.c: In function ‘inspur_pci_probe’:
drivers/gpu/drm/inspur/inspur_drm_drv.c:379:29: warning: unused variable ‘priv’ [-Wunused-variable]

379 | struct inspur_drm_private *priv;

| ^~~~

Fixes: b9d65551 ("drm: add inspur drm driver support")
Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>