kernel.bbclass: Fix syntax error when FDT not used
kernel.bbclass: Fix syntax error when FDT not used

hundeboll/core,sknsean/core,diorcety/oe-lite-core,sknsean/core,sknsean/core,sknsean/core,hundeboll/core,hundeboll/core,hundeboll/core,diorcety/oe-lite-core,sknsean/core