Change the byte of the MemoryAttributes attribute to the size type

We prefer to use size_t type instead of byte type in PDI[1]

[1] https://gerrit.openbmc.org/c/openbmc/phosphor-dbus-interfaces/+/63799

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I211a7cd553338995170407fa583d8926a6c98f53
diff --git a/src/dimm.cpp b/src/dimm.cpp
index c84bc51..72f5ed3 100644
--- a/src/dimm.cpp
+++ b/src/dimm.cpp
@@ -319,7 +319,7 @@
         LocationCode::locationCode(value);
 }
 
-uint8_t Dimm::memoryAttributes(uint8_t value)
+size_t Dimm::memoryAttributes(size_t value)
 {
     return sdbusplus::server::xyz::openbmc_project::inventory::item::Dimm::
         memoryAttributes(value);