Update .gitignore

Author: pettershao-ragilenetworks

.gitignore

@@ -44,6 +44,12 @@ files/Aboot/boot0
 files/initramfs-tools/arista-convertfs
 files/initramfs-tools/union-mount
 
+# Subdirectories in src
+src/preload/gcovpreload/debian/*
+!src/preload/gcovpreload/debian/changelog 
+!src/preload/gcovpreload/debian/control
+!src/preload/gcovpreload/debian/rules 
+
 # Debian byproduct files
 src/**/debian/stamp-*/
 src/**/debian/*.log