kbuild: Fix instrumentation removal breakage on avr32

AVR32 still includes Kconfig.instrumentation, so it won't build after
this...
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/avr32/Kconfig

@@ -235,8 +235,6 @@ source "drivers/Kconfig"
 
 source "fs/Kconfig"
 
-source "kernel/Kconfig.instrumentation"
-
 source "arch/avr32/Kconfig.debug"
 
 source "security/Kconfig"