memory: fix RAM subpages in newly initialized pages

If the first subpage installed in a page is RAM, then we install it as
a full page, instead of a subpage.  Fix by not special casing RAM.

The issue dates to commit db7b5426, which introduced subpages.
Signed-off-by: NAvi Kivity <avi@redhat.com>

exec.c

@@ -2660,13 +2660,12 @@ void cpu_register_physical_memory_log(MemoryRegionSection *section,
                 *p = section_index;
             }
         } else {
-            MemoryRegion *mr = section->mr;
-            p = phys_page_find_alloc(addr >> TARGET_PAGE_BITS, 1);
-            *p = section_index;
-            if (!(memory_region_is_ram(mr) || mr->rom_device)) {
             target_phys_addr_t start_addr2, end_addr2;
             int need_subpage = 0;
 
+            p = phys_page_find_alloc(addr >> TARGET_PAGE_BITS, 1);
+            *p = section_index;
+
             CHECK_SUBPAGE(addr, start_addr, start_addr2, end_addr,
                           end_addr2, need_subpage);
 
@@ -2677,7 +2676,6 @@ void cpu_register_physical_memory_log(MemoryRegionSection *section,
                                  section_index);
             }
         }
-        }
         addr += TARGET_PAGE_SIZE;
     } while (addr != end_addr);