bpf powerpc: Remove unused SEEN_STACK

SEEN_STACK is unused on PowerPC. Remove it. Also, have
SEEN_TAILCALL use 0x40000000.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211012123056.485795-2-hbathini@linux.ibm.com

arch/powerpc/net/bpf_jit.h

@@ -125,8 +125,7 @@
 #define COND_LE		(CR0_GT | COND_CMP_FALSE)
 
 #define SEEN_FUNC	0x20000000 /* might call external helpers */
-#define SEEN_STACK	0x40000000 /* uses BPF stack */
-#define SEEN_TAILCALL	0x80000000 /* uses tail calls */
+#define SEEN_TAILCALL	0x40000000 /* uses tail calls */
 
 #define SEEN_VREG_MASK	0x1ff80000 /* Volatile registers r3-r12 */
 #define SEEN_NVREG_MASK	0x0003ffff /* Non volatile registers r14-r31 */