Remove hardcoded <kernel> version from fwk comp mat

They are injected via assemble_vintf by the build system
at build time. See build/make/target/board/Android.mk.

Test: m system_compatibility_matrix.xml, and manually
inspect $OUT/system/compatibility_matrix.xml; it contains
<kernel> versions.

Bug: 64124223

Change-Id: Ibf82efa0805233dedb6badce7e5a4ff62a9ff769
Merged-In: Ibf82efa0805233dedb6badce7e5a4ff62a9ff769
diff --git a/compatibility_matrix.26.xml b/compatibility_matrix.26.xml
index 9aa5418..ba6b659 100644
--- a/compatibility_matrix.26.xml
+++ b/compatibility_matrix.26.xml
@@ -319,7 +319,4 @@
             <instance>default</instance>
         </interface>
     </hal>
-    <kernel version="4.9.0" />
-    <kernel version="4.4.0" />
-    <kernel version="3.18.0" />
 </compatibility-matrix>
diff --git a/compatibility_matrix.current.xml b/compatibility_matrix.current.xml
index 9603bd6..3184ed3 100644
--- a/compatibility_matrix.current.xml
+++ b/compatibility_matrix.current.xml
@@ -327,7 +327,4 @@
             <instance>default</instance>
         </interface>
     </hal>
-    <kernel version="4.9.0" />
-    <kernel version="4.4.0" />
-    <kernel version="3.18.0" />
 </compatibility-matrix>
diff --git a/compatibility_matrix.legacy.xml b/compatibility_matrix.legacy.xml
index 6167f25..f64cf57 100644
--- a/compatibility_matrix.legacy.xml
+++ b/compatibility_matrix.legacy.xml
@@ -319,7 +319,4 @@
             <instance>default</instance>
         </interface>
     </hal>
-    <kernel version="4.9.0" />
-    <kernel version="4.4.0" />
-    <kernel version="3.18.0" />
 </compatibility-matrix>