kbuild: Allow drivers to fit src/drivers/[X]/[Y]/ scheme

Reorder drivers to fit src/drivers/[X]/[Y]/ scheme to make
them pluggable.

Also, fix up the following driver subdirectories by switching
to the src/drivers/[X]/[Y]/ scheme as these are hard requirements
for the main change:

* drivers/intel
* drivers/pc80
* drivers/dec

Change-Id: I455d3089a317181d5b99bf658df759ec728a5f6b
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/14047
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/ec/compal/ene932/acpi/superio.asl

@@ -21,6 +21,6 @@ Device (SIO) {
 
 // Keyboard or AUX port (a.k.a Mouse)
 #ifdef SIO_EC_ENABLE_PS2K
-	#include <drivers/pc80/ps2_controller.asl>
+	#include <drivers/pc80/pc/ps2_controller.asl>
 #endif
 }