csky: remove obsolete config CPU_TLB_SIZE

Commit 9d35dc30 ("csky: Revert mmu ASID mechanism") removes the only
use of CONFIG_CPU_TLB_SIZE. Since then, this config has no effect and can
be deleted.

Remove the obsolete config CPU_TLB_SIZE.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Guo Ren <guoren@kernel.org>

arch/csky/Kconfig

@@ -166,11 +166,6 @@ config STACKTRACE_SUPPORT
 config TIME_LOW_RES
 	def_bool y
 
-config CPU_TLB_SIZE
-	int
-	default "128"	if (CPU_CK610 || CPU_CK807 || CPU_CK810)
-	default "1024"	if (CPU_CK860)
-
 config CPU_ASID_BITS
 	int
 	default "8"	if (CPU_CK610 || CPU_CK807 || CPU_CK810)