kernel: add define for kernel 6.6

Add define for kernel 6.6.

Signed-off-by: Weijie Gao <[email protected]>

include/kernel-6.6

@@ -0,0 +1,2 @@
+LINUX_VERSION-6.6 = .20
+LINUX_KERNEL_HASH-6.6.20 = e2f6c7f39b304248193370f8c5755553ab73ad5672e92dae994a344084d8dd22