sh: Fix up SH-4A part probe.

The SH-4A series probe we were relying on doesn't work any more on the
newer parts, bump this up to use CVR.CHIP instead so we have consistent
behaviour across all of the parts, which is what this should have been
testing in the first place.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4/probe.c

@@ -53,7 +53,7 @@ int __init detect_cpu_and_cache_system(void)
 	/*
 	 * Setup some generic flags we can probe on SH-4A parts
 	 */
-	if (((pvr >> 16) & 0xff) == 0x10) {
+	if (((pvr >> 24) & 0xff) == 0x10) {
 		if ((cvr & 0x10000000) == 0)
 			boot_cpu_data.flags |= CPU_HAS_DSP;