powerpc: Expose PMCs & cache topology in sysfs on 32-bit

The file arch/powerpc/kernel/sysfs.c is currently only compiled for
64-bit kernels.  It contain code to register CPU sysdevs in sysfs and
add various properties such as cache topology and raw access by root
to performance monitor counters (PMCs).  A lot of that can be re-used
as is on 32-bits.

This makes the file be built for both, with appropriate ifdef'ing
for the few bits that are really 64-bit specific, and adds some
support for the raw PMCs for 75x and 74xx processors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/include/asm/cputable.h

@@ -62,6 +62,7 @@ enum powerpc_pmc_type {
 	PPC_PMC_DEFAULT = 0,
 	PPC_PMC_IBM = 1,
 	PPC_PMC_PA6T = 2,
+	PPC_PMC_G4 = 3,
 };
 
 struct pt_regs;