Remove getBitfieldCount method

Remove the getBitfieldCount method and use the C++20 feature
`std::popcount` to get the number of bits of 1.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I71a5c1a9e10f508ce58a01ec8dc17ed5d96ed8a5
diff --git a/libpldmresponder/pdr_utils.hpp b/libpldmresponder/pdr_utils.hpp
index 9406d46..c463f1f 100644
--- a/libpldmresponder/pdr_utils.hpp
+++ b/libpldmresponder/pdr_utils.hpp
@@ -89,26 +89,6 @@
     return Json::parse(jsonFile);
 }
 
-/** @brief Function to get the Bitfield count to 1
- *
- *  @param[in] bit - Bitfield
- *
- *  @return - uint8_t return the number of 1
- */
-inline uint8_t getBitfieldCount(const bitfield8_t bit)
-{
-    uint8_t count = 0;
-    for (uint8_t i = 0; i < 8; ++i)
-    {
-        if (bit.byte & (1 << i))
-        {
-            ++count;
-        }
-    }
-
-    return count;
-}
-
 /** @brief Populate the mapping between D-Bus property stateId and attribute
  *          value for the effecter PDR enumeration attribute.
  *
diff --git a/libpldmresponder/platform.cpp b/libpldmresponder/platform.cpp
index 893cc83..779a0cd 100644
--- a/libpldmresponder/platform.cpp
+++ b/libpldmresponder/platform.cpp
@@ -615,7 +615,7 @@
     }
 
     // 0x01 to 0x08
-    uint8_t sensorRearmCount = getBitfieldCount(sensorRearm);
+    uint8_t sensorRearmCount = std::popcount(sensorRearm.byte);
     std::vector<get_sensor_state_field> stateField(sensorRearmCount);
     uint8_t comSensorCnt{};
     const pldm::utils::DBusHandler dBusIntf;