powerpc: modules: use r12 for stub jump address.

In ELFv2, r12 is supposed to equal to PC on entry to a function.
Our stubs use r11, so change swap that with r12.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

arch/powerpc/kernel/module_64.c

@@ -67,13 +67,13 @@ struct ppc64_stub_entry
    r2) into the stub. */
 static struct ppc64_stub_entry ppc64_stub =
 { .jump = {
-	0x3d820000,			/* addis   r12,r2, <high> */
-	0x398c0000,			/* addi    r12,r12, <low> */
+	0x3d620000,			/* addis   r11,r2, <high> */
+	0x396b0000,			/* addi    r11,r11, <low> */
 	/* Save current r2 value in magic place on the stack. */
 	0xf8410000|R2_STACK_OFFSET,	/* std     r2,R2_STACK_OFFSET(r1) */
-	0xe96c0020,			/* ld      r11,32(r12) */
-	0xe84c0028,			/* ld      r2,40(r12) */
-	0x7d6903a6,			/* mtctr   r11 */
+	0xe98b0020,			/* ld      r12,32(r11) */
+	0xe84b0026,			/* ld      r2,40(r11) */
+	0x7d8903a6,			/* mtctr   r12 */
 	0x4e800420			/* bctr */
 } };