drm/amdgpu: Use PSP_FW_NAME_LEN instead of magic number

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2631,7 +2631,7 @@ int psp_init_ta_microcode(struct psp_context *psp,
 			  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;