powerpc and powerpc64's <machine/pmap.h> include <sys/mutex.h> too late
and accidentally rely on other code to pull in the header. If the mutex
header is removed from the <machine/softintr.h>, the build fails:

In file included from src/sys/dev/rnd.c:84:
In file included from src/sys/uvm/uvm_extern.h:180:
In file included from src/sys/uvm/uvm_pmap.h:86:
src/sys/arch/powerpc64/compile/GENERIC/obj/machine/pmap.h:38:16: error: field 
has incomplete type 'struct mutex'
        struct mutex            pm_mtx;
                                ^

The following diff fixes the above. Also, it adds <sys/queue.h> in
powerpc's pmap.h for consistency with powerpc64 (struct vm_page_md uses
LIST_HEAD() after all). powerpc64's <machine/intr.h> appears to have
a hidden dependency on <sys/queue.h>.

OK?

Index: arch/powerpc/include/pmap.h
===================================================================
RCS file: src/sys/arch/powerpc/include/pmap.h,v
retrieving revision 1.59
diff -u -p -r1.59 pmap.h
--- arch/powerpc/include/pmap.h 8 Oct 2015 10:20:14 -0000       1.59
+++ arch/powerpc/include/pmap.h 30 May 2021 04:28:46 -0000
@@ -77,6 +77,9 @@ typedef u_int sr_t;
 #define PMAP_CACHE_WT          2       /* writethru */
 #define PMAP_CACHE_WB          3       /* writeback */
 
+#include <sys/mutex.h>
+#include <sys/queue.h>
+
 #ifdef _KERNEL
 
 /*
@@ -164,8 +167,6 @@ int reserve_dumppages(caddr_t p);
 
 #endif /* _KERNEL */
 
-#include <sys/mutex.h>
-
 struct vm_page_md {
        struct mutex pv_mtx;
        LIST_HEAD(,pte_desc) pv_list;
Index: arch/powerpc64/include/intr.h
===================================================================
RCS file: src/sys/arch/powerpc64/include/intr.h,v
retrieving revision 1.13
diff -u -p -r1.13 intr.h
--- arch/powerpc64/include/intr.h       24 Oct 2020 21:42:10 -0000      1.13
+++ arch/powerpc64/include/intr.h       30 May 2021 04:28:46 -0000
@@ -19,6 +19,8 @@
 #ifndef _MACHINE_INTR_H_
 #define _MACHINE_INTR_H_
 
+#include <sys/queue.h>
+
 struct cpu_info;
 struct trapframe;
 
Index: arch/powerpc64/include/pmap.h
===================================================================
RCS file: src/sys/arch/powerpc64/include/pmap.h,v
retrieving revision 1.16
diff -u -p -r1.16 pmap.h
--- arch/powerpc64/include/pmap.h       11 May 2021 18:21:12 -0000      1.16
+++ arch/powerpc64/include/pmap.h       30 May 2021 04:28:46 -0000
@@ -19,6 +19,9 @@
 #ifndef _MACHINE_PMAP_H_
 #define _MACHINE_PMAP_H_
 
+#include <sys/mutex.h>
+#include <sys/queue.h>
+
 #ifdef _KERNEL
 
 #include <machine/pte.h>
@@ -80,9 +83,6 @@ struct pte *pmap_get_kernel_pte(vaddr_t)
 
 #endif /* _KERNEL */
 
-#include <sys/mutex.h>
-#include <sys/queue.h>
-
 struct vm_page_md {
        struct mutex pv_mtx;
        LIST_HEAD(,pte_desc) pv_list;

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