nvme_manager: skip smbus reading when power good is false

In order to reduce error log of `SendSmbusRWCmdRAW failed`, skip
nvme data read via smbus when power good is false.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: Ie33f0597a09f5ef5bd0892c6df07668a3e8b03e1
diff --git a/nvme_manager.hpp b/nvme_manager.hpp
index 08cfc76..e837961 100644
--- a/nvme_manager.hpp
+++ b/nvme_manager.hpp
@@ -130,7 +130,7 @@
                             phosphor::nvme::Nvme::NVMeData& nvmeData);
 
     /** @brief read and update NVME data to dbus */
-    void readNvmeData(NVMeConfig& config);
+    void readNvmeData(NVMeConfig& config, bool isPwrGood);
 
   private:
     /** @brief sdbusplus bus client connection. */