selftests/powerpc: Fix 32-bit BE build errors on Ubuntu 24.04

Starting with Ubuntu 24.04, building the selftests with the big endian
compiler (which defaults to 32-bit) fails with errors:

stack_expansion_ldst.c:178:37: error: format '%lx' expects argument
of type 'long unsigned int', but argument 2 has type 'rlim_t' {aka 'long long unsigned int'}
subpage_prot.c:214:38: error: format '%lx' expects argument of type
'long unsigned int', but argument 3 has type 'off_t' {aka 'long long int'}

Prior to 24.04 rlim_t was long unsigned int, and off_t was long int.

Cast to unsigned long long and long long before passing to printf to
avoid the errors.

Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

tools/testing/selftests/powerpc/mm/stack_expansion_ldst.c

···
 
 	page_size = getpagesize();
 	getrlimit(RLIMIT_STACK, &rlimit);
-	printf("Stack rlimit is 0x%lx\n", rlimit.rlim_cur);
+	printf("Stack rlimit is 0x%llx\n", (unsigned long long)rlimit.rlim_cur);
 
 	printf("Testing loads ...\n");
 	test_one_type(LOAD, page_size, rlimit.rlim_cur);

tools/testing/selftests/powerpc/mm/subpage_prot.c

···
 		perror("failed to map file");
 		return 1;
 	}
-	printf("allocated %s for 0x%lx bytes at %p\n",
-	       file_name, filesize, fileblock);
+	printf("allocated %s for 0x%llx bytes at %p\n",
+	       file_name, (long long)filesize, fileblock);
 
 	printf("testing file map...\n");