Re-add minigbm to default manifest

Bug: 77276633
Test: repo sync && m -j128
Change-Id: Id2d5a42b2f14350fe1769a1ef14ba0c8e5a52c44

default.xml

@@ -245,6 +245,7 @@
   <project path="external/mdnsresponder" name="platform/external/mdnsresponder" groups="pdk" />
   <project path="external/mesa3d" name="platform/external/mesa3d" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/Microsoft-GSL" name="platform/external/Microsoft-GSL" groups="pdk" />
+  <project path="external/minigbm" name="platform/external/minigbm" groups="pdk" />
   <project path="external/minijail" name="platform/external/minijail" groups="pdk" />
   <project path="external/mksh" name="platform/external/mksh" groups="pdk" />
   <project path="external/mmc-utils" name="platform/external/mmc-utils" groups="pdk" />