Add suppression for non-zero index access in logd

cppcheck generates a warning about the non-zero index access in the
toCpu function. This is expected behavior so the warning has been
suppressed.

Change-Id: I852ca8f0b987215156edb826e643e3844e35049d
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
diff --git a/utils/ethosu_logd/main.cpp b/utils/ethosu_logd/main.cpp
index 1d84caa..fac95d6 100644
--- a/utils/ethosu_logd/main.cpp
+++ b/utils/ethosu_logd/main.cpp
@@ -207,10 +207,12 @@
 
         if (isBigEndian()) {
             for (size_t i = 0; i < sizeof(T); i++) {
+                // cppcheck-suppress objectIndex
                 d[i] = src[i];
             }
         } else {
             for (size_t i = 0; i < sizeof(T); i++) {
+                // cppcheck-suppress objectIndex
                 d[i] = src[sizeof(T) - 1 - i];
             }
         }