Add <kernel> entry to fwk compat mat.

Test: builds and verify that system/compatibility_matrix.xml
      has configs filled.
Test: `vintf | tail` on marlin shows that fwk compat mat
      is compatible with runtime info.

Bug: 38324908
Change-Id: I8a35ea582fea1faa083c409ec58813c3ac82dc9c
Merged-In: I8a35ea582fea1faa083c409ec58813c3ac82dc9c