amdsmi cannot read power cap more than 10 characters

Extend the default read array size.

Change-Id: I2739981873cb3c360661e3ef5f6e70d4f36cb0e8

src/amd_smi/amd_smi_utils.cc

@@ -218,7 +218,7 @@ amdsmi_status_t smi_amdgpu_get_power_cap(amd::smi::AMDSmiGPUDevice* device, int
     if (!device->check_if_drm_is_supported()) {
         return AMDSMI_STATUS_NOT_SUPPORTED;
     }
-    constexpr int DATA_SIZE = 10;
+    constexpr int DATA_SIZE = 16;
     char val[DATA_SIZE];
     std::string fullpath;
     amdsmi_status_t ret = AMDSMI_STATUS_SUCCESS;