drm/amdgpu: Use PSP_FW_NAME_LEN instead of magic number

Signed-off-by: Bhawanpreet Lakha <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c

···
 			  const char *chip_name)
 {
 	struct amdgpu_device *adev = psp->adev;
-	char fw_name[30];
+	char fw_name[PSP_FW_NAME_LEN];
 	const struct ta_firmware_header_v2_0 *ta_hdr;
 	int err = 0;
 	int ta_index = 0;