rtc: rtc-sh: Split out the CPU defs to asm/cpu/.

With all of the different CPU types this was getting a but unwieldly.
Since sh64 is now integrated, we don't have to worry about multiple
architectures caring about the header definitions.

Split out the defs for each asm/cpu/ to make rtc-sh slightly less
visually offensive.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/rtc.h b/include/asm-sh/rtc.h
index 858da99..ec45ba8 100644
--- a/include/asm-sh/rtc.h
+++ b/include/asm-sh/rtc.h
@@ -11,4 +11,6 @@
 	unsigned long capabilities;
 };
 
+#include <asm/cpu/rtc.h>
+
 #endif /* _ASM_RTC_H */