powerpc: Remove remaining stab codes

Following commit 12318163 ("powerpc/32: Remove remaining .stabs
annotations"), stabs code are not used anymore.

Remove them.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d8b33342d7454f6ca4f368f5206896558dfa06f4.1645538722.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/ppc_asm.h

@@ -692,12 +692,6 @@ END_FTR_SECTION_NESTED(CPU_FTR_CELL_TB_BUG, CPU_FTR_CELL_TB_BUG, 96)
 #define	evr30	30
 #define	evr31	31
 
-/* some stab codes */
-#define N_FUN	36
-#define N_RSYM	64
-#define N_SLINE	68
-#define N_SO	100
-
 #define RFSCV	.long 0x4c0000a4
 
 /*