sh: drop unused Kconfig symbol

Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Tested-by: NNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: NMichal Marek <mmarek@suse.cz>

arch/sh/Kconfig

@@ -101,10 +101,6 @@ config GENERIC_LOCKBREAK
 	def_bool y
 	depends on SMP && PREEMPT
 
-config SYS_SUPPORTS_PM
-	bool
-	depends on !SMP
-
 config ARCH_SUSPEND_POSSIBLE
 	def_bool n