fix PPC32 compile failure due to SPRN_HID2 being undefined

Compiling 2.4.22-pre3 for a 6xx-class PowerPC fails in cpu_setup_6xx.S:

ppc-unknown-linux-gcc -D__ASSEMBLY__ -D__KERNEL__ -I/tmp/linux-2.4.22-pre3/include -I/tmp/linux-2.4.22-pre3/arch/ppc   -c -o cpu_setup_6xx.o cpu_setup_6xx.S
cpu_setup_6xx.S: Assembler messages:
cpu_setup_6xx.S:325: Error: unsupported relocation against SPRN_HID2
cpu_setup_6xx.S:416: Error: unsupported relocation against SPRN_HID2
make[1]: *** [cpu_setup_6xx.o] Error 1
make[1]: Leaving directory `/tmp/linux-2.4.22-pre3/arch/ppc/kernel'
make: *** [_dir_arch/ppc/kernel] Error 2

SPRN_HID2 should be a #defined constant, but it isn't. The patch
below from 2.4.21-ben2 (rediffed for 2.4.22-pre3) fixes the problem.

/Mikael

diff -ruN linux-2.4.22-pre3/include/asm-ppc/processor.h linux-2.4.22-pre3.ppc-hid2-fix/include/asm-ppc/processor.h
--- linux-2.4.22-pre3/include/asm-ppc/processor.h	2003-07-06 18:37:48.000000000 +0200
+++ linux-2.4.22-pre3.ppc-hid2-fix/include/asm-ppc/processor.h	2003-07-06 22:24:10.000000000 +0200
@@ -248,6 +248,7 @@
 #define	  HID0_NOPDST	(1<<1)		/* No-op dst, dstt, etc. instr. */
 #define	  HID0_NOPTI	(1<<0)		/* No-op dcbt and dcbst instr. */
 #define	SPRN_HID1	0x3F1	/* Hardware Implementation Register 1 */
+#define	SPRN_HID2	0x3F8	/* Hardware Implementation Register 2 */
 #define	SPRN_IABR	0x3F2	/* Instruction Address Breakpoint Register */
 #define	SPRN_IAC1	0x3F4	/* Instruction Address Compare 1 */
 #define	SPRN_IAC2	0x3F5	/* Instruction Address Compare 2 */
-
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