target/ppc: Remove unused struct 'mmu_ctx_hash32'

I think it's use was removed by
Commit 5883d8b296 ("mmu-hash*: Don't use full ppc_hash{32,
64}_translate() path for get_phys_page_debug()")

Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
diff --git a/target/ppc/mmu-hash32.c b/target/ppc/mmu-hash32.c
index 6dfedab..da6e8b2 100644
--- a/target/ppc/mmu-hash32.c
+++ b/target/ppc/mmu-hash32.c
@@ -37,12 +37,6 @@
 #  define LOG_BATS(...) do { } while (0)
 #endif
 
-struct mmu_ctx_hash32 {
-    hwaddr raddr;      /* Real address              */
-    int prot;                      /* Protection bits           */
-    int key;                       /* Access key                */
-};
-
 static int ppc_hash32_pp_prot(int key, int pp, int nx)
 {
     int prot;