sh: Disable psw support for R7785RP.

While R7780RP and R7780MP support this, R7785RP does not.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/renesas/r7780rp/Makefile

@@ -3,5 +3,8 @@
 #
 irqinit-y			:= irq-r7780rp.o
 irqinit-$(CONFIG_SH_R7785RP)	:= irq-r7785rp.o
-obj-y	 			:= setup.o irq.o $(irqinit-y)
+obj-y				:= setup.o irq.o $(irqinit-y)
+
+ifneq ($(CONFIG_SH_R7785RP),y)
 obj-$(CONFIG_PUSH_SWITCH)	+= psw.o
+endif